GeezerVison

Move _PyIsSelectable_fd() macro to the internal C API
(pycore_fileutils.h).

* main: (73 commits)
  Thoroughly refactor the cases generator (python#107151)
  Docs: Add missing markup to Argument Clinic docs (python#106876)
  pythongh-107162: Document errcode.h usage in its comment (python#107177)
  pythongh-106320: Remove private _PyDict C API (python#107145)
  Fix PyVectorcall_Function doc versionadded (python#107140)
  Docs: Remove duplicate word in Argument Clinic howto heading (python#107169)
  pythongh-107017: Change Chapter Strings to Texts in the Introduction chapter. (python#107104)
  pythongh-106320: Remove private _PyObject C API (python#107159)
  Docs: fix typo in os.pwrite docstring (python#107087)
  pythongh-105291: Add link to migration guide for distutils (python#107130)
  pythongh-106948: Docs: Disable links for C standard library functions, OS utility functions and system calls (python#107062)
  pythongh-106320: Remove _PyBytes_Join() C API (python#107144)
  pythongh-106320: Remove private _PyObject C API (python#107147)
  pythongh-106320: Remove _PyTuple_MaybeUntrack() C API (python#107143)
  pythongh-106320: Remove _PyIsSelectable_fd() C API (python#107142)
  Remove superflous whitespaces in `layout.html`. (pythonGH-107067)
  pythongh-107122: Update what's news for dbm.*dbm.clear() method (pythongh-107135)
  pythongh-107122: Add clear method to dbm.ndbm module (pythongh-107126)
  pythongh-62519: Make pgettext search plurals when translation is not found (python#107118)
  pythongh-107122: Add clear method to dbm.gdbm.module (pythongh-107127)
  ...