sphinx Python package broken due to setuptools deprecation enforcement

[iorsh]

Describe the bug

Please see pypa/setuptools#4870

Sphinx package installation is broken now (e.g. in FontForge CI):

Collecting sphinx
  Downloading sphinx-8.2.3-py3-none-any.whl.metadata (7.0 kB)
Collecting typing
  Downloading typing-3.7.4.3.tar.gz (78 kB)
  Installing build dependencies: started
  Installing build dependencies: finished with status 'done'
  Getting requirements to build wheel: started
  Getting requirements to build wheel: finished with status 'error'
  error: subprocess-exited-with-error
  
  Getting requirements to build wheel did not run successfully.
  exit code: 1
  
  [31 lines of output]
  Traceback (most recent call last):
    File "D:/a/fontforge/fontforge/repo/build/sphinx-venv/lib/python3.12/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 353, in <module>
      main()
    File "D:/a/fontforge/fontforge/repo/build/sphinx-venv/lib/python3.12/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 335, in main
      json_out['return_val'] = hook(**hook_input['kwargs'])
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "D:/a/fontforge/fontforge/repo/build/sphinx-venv/lib/python3.12/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 118, in get_requires_for_build_wheel
      return hook(config_settings)
             ^^^^^^^^^^^^^^^^^^^^^
    File "D:/a/_temp/msys64/tmp/pip-build-env-sy5csid3/overlay/lib/python3.12/site-packages/setuptools/build_meta.py", line 334, in get_requires_for_build_wheel
      return self._get_build_requires(config_settings, requirements=[])
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "D:/a/_temp/msys64/tmp/pip-build-env-sy5csid3/overlay/lib/python3.12/site-packages/setuptools/build_meta.py", line 304, in _get_build_requires
      self.run_setup()
    File "D:/a/_temp/msys64/tmp/pip-build-env-sy5csid3/overlay/lib/python3.12/site-packages/setuptools/build_meta.py", line 522, in run_setup
      super().run_setup(setup_script=setup_script)
    File "D:/a/_temp/msys64/tmp/pip-build-env-sy5csid3/overlay/lib/python3.12/site-packages/setuptools/build_meta.py", line 320, in run_setup
      exec(code, locals())
    File "<string>", line 57, in <module>
    File "D:/a/_temp/msys64/tmp/pip-build-env-sy5csid3/overlay/lib/python3.12/site-packages/setuptools/__init__.py", line 116, in setup
      _install_setup_requires(attrs)
    File "D:/a/_temp/msys64/tmp/pip-build-env-sy5csid3/overlay/lib/python3.12/site-packages/setuptools/__init__.py", line 87, in _install_setup_requires
      dist.parse_config_files(ignore_option_errors=True)
    File "D:/a/_temp/msys64/tmp/pip-build-env-sy5csid3/overlay/lib/python3.12/site-packages/setuptools/dist.py", line 730, in parse_config_files
      self._parse_config_files(filenames=inifiles)
    File "D:/a/_temp/msys64/tmp/pip-build-env-sy5csid3/overlay/lib/python3.12/site-packages/setuptools/dist.py", line 599, in _parse_config_files
      opt = self._enforce_underscore(opt, section)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "D:/a/_temp/msys64/tmp/pip-build-env-sy5csid3/overlay/lib/python3.12/site-packages/setuptools/dist.py", line 629, in _enforce_underscore
      raise InvalidConfigError(
  setuptools.errors.InvalidConfigError: Invalid dash-separated key 'license-file' in 'metadata' (setup.cfg), please use the underscore name 'license_file' instead.
  [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.

How to Reproduce

Try to install sphinx Python package with setuptools 78.0.1

Environment Information

No info, can't be installed.

Sphinx extensions

Additional context

No response

[AA-Turner]

Sphinx does not use setuptools, and has not done so for three years. The log you uploaded appears to show a failure building the typing PyPI package, which should not be needed -- it is a built in standard library module in all supported versions of Python.

A