setuptools deprecation warnings

[mgorny]

Building the wheel for 3.3.1 yields the following deprecation warnings:

/usr/lib/pypy3.10/site-packages/setuptools/_distutils/dist.py:289: UserWarning: Unknown distribution option: 'test_suite'
  warnings.warn(msg)
/usr/lib/pypy3.10/site-packages/setuptools/dist.py:759: SetuptoolsDeprecationWarning: License classifiers are deprecated.
!!

        ********************************************************************************
        Please consider removing the following classifiers in favor of a SPDX license expression:

        License :: OSI Approved :: MIT License

        See https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license for details.
        ********************************************************************************

!!
  self._finalize_license_expression()
2025-03-31 08:07:28,495 root INFO running bdist_wheel
/usr/lib/pypy3.10/site-packages/setuptools/_distutils/cmd.py:135: SetuptoolsDeprecationWarning: bdist_wheel.universal is deprecated
!!

        ********************************************************************************
        With Python 2.7 end-of-life, support for building universal wheels
        (i.e., wheels that support both Python 2 and Python 3)
        is being obviated.
        Please discontinue using this option, or if you still need it,
        file an issue with pypa/setuptools describing your use case.

        By 2025-Aug-30, you need to update your project and remove deprecated calls
        or your builds will no longer be supported.
        ********************************************************************************

!!
  self.finalize_options()