gh-36983: Prepare python3 `spkg-configure.m4` for Python 3.12 (setuptools instead of distutils)
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- Cherry-picked from #36181
This PR does not change what versions are accepted!
To test with Python 3.12, still need to adjust the version bound set in
`build/pkgs/python3/spkg-configure.m4`.
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- Depends on #36957 (merged here to resolve merge conflict)
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URL: https://github.com/sagemath/sage/pull/36983
Reported by: Matthias Köppe
Reviewer(s): Gonzalo Tornaría, Matthias Köppe
