setup.cfg now only allows underscore key, not dash.

[daeho-ro]

      File "/tmp/pip-build-env-eghujpsq/overlay/lib/python3.13/site-packages/setuptools/dist.py", line 730, in parse_config_files
        self._parse_config_files(filenames=inifiles)
        ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
      File "/tmp/pip-build-env-eghujpsq/overlay/lib/python3.13/site-packages/setuptools/dist.py", line 599, in _parse_config_files
        opt = self._enforce_underscore(opt, section)
      File "/tmp/pip-build-env-eghujpsq/overlay/lib/python3.13/site-packages/setuptools/dist.py", line 629, in _enforce_underscore
        raise InvalidConfigError(
        ...<3 lines>...
        )
    setuptools.errors.InvalidConfigError: Invalid dash-separated key 'description-file' in 'metadata' (setup.cfg), please use the underscore name 'description_file' instead.
    error: subprocess-exited-with-error
    
    × Getting requirements to build wheel did not run successfully.
    │ exit code: 1
    ╰─> See above for output.
    
    note: This error originates from a subprocess, and is likely not a problem with pip.
    full command: /home/linuxbrew/.linuxbrew/Cellar/ford/7.0.10/libexec/bin/python /home/linuxbrew/.linuxbrew/lib/python3.13/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py get_requires_for_build_wheel /tmp/tmpc38ofofv
    cwd: /tmp/ford--markdown-include-20250324-12596-tsgelu/markdown-include-0.7.2
    Getting requirements to build wheel: finished with status 'error'

It seems that the hyphen character is finally deprecated to support, and so the key description-file should be changed into description_file.

[daeho-ro]

https://setuptools.pypa.io/en/latest/history.html