GeezerVison

* main: (24 commits)
  pythongh-98040: Move the Single-Phase Init Tests Out of test_imp (pythongh-102561)
  pythongh-83861: Fix datetime.astimezone() method (pythonGH-101545)
  pythongh-102856: Clean some of the PEP 701 tokenizer implementation (python#103634)
  pythongh-102856: Skip test_mismatched_parens in WASI builds (python#103633)
  pythongh-102856: Initial implementation of PEP 701 (python#102855)
  pythongh-103583: Add ref. dependency between multibytecodec modules (python#103589)
  pythongh-83004: Harden msvcrt further (python#103420)
  pythonGH-88342: clarify that `asyncio.as_completed` accepts generators yielding tasks (python#103626)
  pythongh-102778: IDLE - make sys.last_exc available in Shell after traceback (python#103314)
  pythongh-103582: Remove last references to `argparse.REMAINDER` from docs (python#103586)
  pythongh-103583: Always pass multibyte codec structs as const (python#103588)
  pythongh-103617: Fix compiler warning in _iomodule.c (python#103618)
  pythongh-103596: [Enum] do not shadow mixed-in methods/attributes (pythonGH-103600)
  pythonGH-100530: Change the error message for non-class class patterns (pythonGH-103576)
  pythongh-95299: Remove lingering setuptools reference in installer scripts (pythonGH-103613)
  [Doc] Fix a typo in optparse.rst (python#103504)
  pythongh-101100: Fix broken reference `__format__` in `string.rst` (python#103531)
  pythongh-95299: Stop installing setuptools as a part of ensurepip and venv (python#101039)
  pythonGH-103484: Docs: add linkcheck allowed redirects entries for most cases (python#103569)
  pythongh-67230: update whatsnew note for csv changes (python#103598)
  ...

This is a refactoring change that aims to simplify ``ensurepip``.
Before it, this module had legacy infrastructure that made an
assumption that ``ensurepip`` would be provisioning more then just a
single wheel. That assumption is no longer true since [[1]][[2]][[3]].

In this change, the improvement is done around removing unnecessary
loops and supporting structures to change the assumptions to expect
only the bundled or replacement ``pip`` wheel.

[1]: python@ece20db
[2]: python#101039
[2]: python#95299

This is a refactoring change that aims to simplify ``ensurepip``.
Before it, this module had legacy infrastructure that made an
assumption that ``ensurepip`` would be provisioning more then just a
single wheel. That assumption is no longer true since [[1]][[2]][[3]].

In this change, the improvement is done around removing unnecessary
loops and supporting structures to change the assumptions to expect
only the bundled or replacement ``pip`` wheel.

[1]: python@ece20db
[2]: python#101039
[3]: python#95299

This is a refactoring change that aims to simplify ``ensurepip``.
Before it, this module had legacy infrastructure that made an
assumption that ``ensurepip`` would be provisioning more then just a
single wheel. That assumption is no longer true since [[1]][[2]][[3]].

In this change, the improvement is done around removing unnecessary
loops and supporting structures to change the assumptions to expect
only the bundled or replacement ``pip`` wheel.

[1]: python@ece20db
[2]: python#101039
[3]: python#95299

This is a refactoring change that aims to simplify ``ensurepip``.
Before it, this module had legacy infrastructure that made an
assumption that ``ensurepip`` would be provisioning more then just a
single wheel. That assumption is no longer true since [[1]][[2]][[3]].

In this change, the improvement is done around removing unnecessary
loops and supporting structures to change the assumptions to expect
only the bundled or replacement ``pip`` wheel.

[1]: python@ece20db
[2]: python#101039
[3]: python#95299

This is a refactoring change that aims to simplify ``ensurepip``.
Before it, this module had legacy infrastructure that made an
assumption that ``ensurepip`` would be provisioning more then just a
single wheel. That assumption is no longer true since [[1]][[2]][[3]].

In this change, the improvement is done around removing unnecessary
loops and supporting structures to change the assumptions to expect
only the bundled or replacement ``pip`` wheel.

[1]: python@ece20db
[2]: python#101039
[3]: python#95299

Currently `get-pip.py` installs not only pip, but also setuptools and
wheel by default, unless the `--no-setuptools` / `--no-wheel` (or
`PIP_NO_SETUPTOOLS` / `PIP_NO_WHEEL` env vars) are used.

This has historically been necessary, however, modern versions of pip
will now fallback to `pyproject.toml` (PEP 517: [1]) based builds (which
will default to a setuptools backend, and thus automatically install
setuptools and wheel in the isolated build environment) if either
setuptools is not installed (as of pip 22.1: [2]), or if wheel is not
installed (as of pip 23.1: [3]).

In addition, as of Python 3.12, the stdlib's `ensurepip` and `venv`
modules no longer install setuptools, and only install pip ([4]).

As such, it is now time for `get-pip.py` to stop installing setuptools
and wheel by default on Python 3.12+, in order to:
- Act as another small step towards `pyproject.toml` / PEP 517
  based builds eventually becoming the pip default.
- Improve parity with the behaviour of `ensurepip` / `venv` on
  Python 3.12+.
- Allow `get-pip.py` to focus on its primary responsibility:
  bootstrapping Pip.

Closes pypa#200.

[1]: https://peps.python.org/pep-0517/
[2]: pypa/pip#10717
[3]: pypa/pip#11871
[4]: python/cpython#101039

Currently `get-pip.py` installs not only pip, but also setuptools and
wheel by default, unless the `--no-setuptools` / `--no-wheel` (or
`PIP_NO_SETUPTOOLS` / `PIP_NO_WHEEL` env vars) are used.

This has historically been necessary, however, modern versions of pip
will now fallback to `pyproject.toml` (PEP 517: [1]) based builds (which
will default to a setuptools backend, and thus automatically install
setuptools and wheel in the isolated build environment) if either
setuptools is not installed (as of pip 22.1: [2]), or if wheel is not
installed (as of pip 23.1: [3]).

In addition, as of Python 3.12, the stdlib's `ensurepip` and `venv`
modules no longer install setuptools, and only install pip ([4]).

As such, it is now time for `get-pip.py` to stop installing setuptools
and wheel by default on Python 3.12+, in order to:
- Act as another small step towards `pyproject.toml` / PEP 517
  based builds eventually becoming the pip default.
- Improve parity with the behaviour of `ensurepip` / `venv` on
  Python 3.12+.
- Allow `get-pip.py` to focus on its primary responsibility:
  bootstrapping Pip.

Closes pypa#200.

[1]: https://peps.python.org/pep-0517/
[2]: pypa/pip#10717
[3]: pypa/pip#11871
[4]: python/cpython#101039

Currently `get-pip.py` installs not only pip, but also setuptools and
wheel by default, unless the `--no-setuptools` / `--no-wheel` (or
`PIP_NO_SETUPTOOLS` / `PIP_NO_WHEEL` env vars) are used.

This has historically been necessary, however, modern versions of pip
will now fallback to `pyproject.toml` (PEP 517: [1]) based builds (which
will default to a setuptools backend, and thus automatically install
setuptools and wheel in the isolated build environment) if either
setuptools is not installed (as of pip 22.1: [2]), or if wheel is not
installed (as of pip 23.1: [3]).

In addition, as of Python 3.12, the stdlib's `ensurepip` and `venv`
modules no longer install setuptools, and only install pip ([4]).

As such, it is now time for `get-pip.py` to stop installing setuptools
and wheel by default on Python 3.12+, in order to:
- Act as another small step towards `pyproject.toml` / PEP 517
  based builds eventually becoming the pip default.
- Improve parity with the behaviour of `ensurepip` / `venv` on
  Python 3.12+.
- Allow `get-pip.py` to focus on its primary responsibility:
  bootstrapping Pip.

Closes pypa#200.

[1]: https://peps.python.org/pep-0517/
[2]: pypa/pip#10717
[3]: pypa/pip#11871
[4]: python/cpython#101039

Currently `get-pip.py` installs not only pip, but also setuptools and
wheel by default, unless the `--no-setuptools` / `--no-wheel` (or
`PIP_NO_SETUPTOOLS` / `PIP_NO_WHEEL` env vars) are used.

This has historically been necessary, however, modern versions of pip
will now fallback to `pyproject.toml` (PEP 517: [1]) based builds (which
will default to a setuptools backend, and thus automatically install
setuptools and wheel in the isolated build environment) if either
setuptools is not installed (as of pip 22.1: [2]), or if wheel is not
installed (as of pip 23.1: [3]).

In addition, as of Python 3.12, the stdlib's `ensurepip` and `venv`
modules no longer install setuptools, and only install pip ([4]).

As such, it is now time for `get-pip.py` to stop installing setuptools
and wheel by default on Python 3.12+, in order to:
- Act as another small step towards `pyproject.toml` / PEP 517
  based builds eventually becoming the pip default.
- Improve parity with the behaviour of `ensurepip` / `venv` on
  Python 3.12+.
- Allow `get-pip.py` to focus on its primary responsibility:
  bootstrapping Pip.

Closes pypa#200.

[1]: https://peps.python.org/pep-0517/
[2]: pypa/pip#10717
[3]: pypa/pip#11871
[4]: python/cpython#101039

Currently the buildpack performs a system site-packages install of not
only pip, but also setuptools and wheel. This has historically been
necessary for pip to be able to build source distributions (sdists) for
packages that don't ship with compatible wheels.

However:
- Thanks to PEP 518, packages can now (and many already do) specify an
  explicit build backend using `[build-system]` in their
  `pyproject.toml`. The dependencies specified in that config (such as
  setuptools and wheel) will be installed by pip into an isolated and
  ephemeral build environment as part of the source distribution build
  process. Such packages therefore don't need/use globally installed
  setuptools/wheel versions.
- As of pip v22.1, pip will now default to the isolated build environment
  mode (along with a fallback legacy setuptools build backend), if the
  setuptools package isn't installed globally. This means that packages
  that haven't yet migrated to a PEP 518 `pyproject.toml` build backend
  config can still build even if setuptools isn't installed globally.

There are a small number of rarely used packages in the wild that
aren't compatible with build isolation mode, however, these typically
require more build dependencies than just setuptools, which means they
wouldn't have worked with this buildpack anyway.

As such, it's no longer necessary for us to install setuptools and wheel
globally. This matches the behaviour of the `venv` and `ensurepip` modules
in Python 3.12+, where setuptools and wheel installation has also been
removed. And it also matches the default behaviour of Poetry too, whose
`install --sync` command removes any implicitly installed packages in the
current environment (other than pip).

See:
https://peps.python.org/pep-0518/
https://pip.pypa.io/en/stable/reference/build-system/
https://pip.pypa.io/en/stable/reference/build-system/pyproject-toml/#build-isolation
pypa/pip#10717
python/cpython#101039
pypa/get-pip#218
astral-sh/uv#2252

GUS-W-16437776.

Currently the buildpack performs a system site-packages install of not
only pip, but also setuptools and wheel. This has historically been
necessary for pip to be able to build source distributions (sdists) for
packages that don't ship with compatible wheels.

However:
- Thanks to PEP 518, packages can now (and many already do) specify an
  explicit build backend using `[build-system]` in their
  `pyproject.toml`. The dependencies specified in that config (such as
  setuptools and wheel) will be installed by pip into an isolated and
  ephemeral build environment as part of the source distribution build
  process. Such packages therefore don't need/use globally installed
  setuptools/wheel versions.
- As of pip v22.1, pip will now default to the isolated build environment
  mode (along with a fallback legacy setuptools build backend), if the
  setuptools package isn't installed globally. This means that packages
  that haven't yet migrated to a PEP 518 `pyproject.toml` build backend
  config can still build even if setuptools isn't installed globally.

There are a small number of rarely used packages in the wild that
aren't compatible with build isolation mode, however, these typically
require more build dependencies than just setuptools, which means they
wouldn't have worked with this buildpack anyway.

As such, it's no longer necessary for us to install setuptools and wheel
globally. This matches the behaviour of the `venv` and `ensurepip` modules
in Python 3.12+, where setuptools and wheel installation has also been
removed. And it also matches the default behaviour of Poetry too, whose
`install --sync` command removes any implicitly installed packages in the
current environment (other than pip).

See:
https://peps.python.org/pep-0518/
https://pip.pypa.io/en/stable/reference/build-system/
https://pip.pypa.io/en/stable/reference/build-system/pyproject-toml/#build-isolation
pypa/pip#10717
python/cpython#101039
pypa/get-pip#218
astral-sh/uv#2252

GUS-W-16437776.

Currently the buildpack performs a system site-packages install of not
only pip, but also setuptools and wheel. This has historically been
necessary for pip to be able to build source distributions (sdists) for
packages that don't ship with compatible wheels.

However:
- Thanks to PEP 518, packages can now (and many already do) specify an
  explicit build backend using `[build-system]` in their
  `pyproject.toml`. The dependencies specified in that config (such as
  setuptools and wheel) will be installed by pip into an isolated and
  ephemeral build environment as part of the source distribution build
  process. Such packages therefore don't need/use globally installed
  setuptools/wheel versions.
- As of pip v22.1, pip will now default to the isolated build environment
  mode (along with a fallback legacy setuptools build backend), if the
  setuptools package isn't installed globally. This means that packages
  that haven't yet migrated to a PEP 518 `pyproject.toml` build backend
  config can still build even if setuptools isn't installed globally.

There are a small number of rarely used packages in the wild that
aren't compatible with build isolation mode, however, these typically
require more build dependencies than just setuptools, which means they
wouldn't have worked with this buildpack anyway.

As such, it's no longer necessary for us to install setuptools and wheel
globally. This matches the behaviour of the `venv` and `ensurepip` modules
in Python 3.12+, where setuptools and wheel installation has also been
removed. And it also matches the default behaviour of Poetry too, whose
`install --sync` command removes any implicitly installed packages in the
current environment (other than pip).

See:
https://peps.python.org/pep-0518/
https://pip.pypa.io/en/stable/reference/build-system/
https://pip.pypa.io/en/stable/reference/build-system/pyproject-toml/#build-isolation
pypa/pip#10717
python/cpython#101039
pypa/get-pip#218
astral-sh/uv#2252

GUS-W-16437776.