Fix setuptools deprecation warnings

[mgorny]

Update keys used in setup.cfg in order to fix the following setuptools deprecation warnings:

The license_file parameter is deprecated, use license_files instead.

Usage of dash-separated 'provides-extra' will not be supported
in future versions. Please use the underscore name 'provides_extra'
instead

Usage of dash-separated 'requires-dist' will not be supported
in future versions. Please use the underscore name 'requires_dist'
instead

[JeremyDega]

Thanks for the efforts, but I have updated as you instructed but still getting this error:

C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.10_3.10.2544.0_x64__qbz5n2kfra8p0\lib\site-packages\setuptools\dist.py:771: UserWarning: Usage of dash-separated 'provides-extra' will not be supported in future versions. Please use the underscore name 'provides_extra' instead
warnings.warn(
C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.10_3.10.2544.0_x64__qbz5n2kfra8p0\lib\site-packages\setuptools\dist.py:771: UserWarning: Usage of dash-separated 'requires-dist' will not be supported in future versions. Please use the underscore name 'requires_dist' instead
warnings.warn(
C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.10_3.10.2544.0_x64__qbz5n2kfra8p0\lib\site-packages\setuptools\config\setupcfg.py:508: SetuptoolsDeprecationWarning: The license_file parameter is deprecated, use license_files instead.
warnings.warn(msg, warning_class)
usage: setup.py [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]
or: setup.py --help [cmd1 cmd2 ...]
or: setup.py --help-commands
or: setup.py cmd --help

error: no commands supplied

[SpecLad]

Looks like this has been obsoleted by #7012.

[nateprewitt]

Resolving since the setup.cfg is no longer relevant.