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Oh, I forgot the mention "Tests / Check if generated files are up to date" job error message:
LD_LIBRARY_PATH=/home/runner/work/cpython/cpython:/opt/hostedtoolcache/Python/3.9.2/x64/lib ./python ./Tools/scripts/stable_abi.py check ./Doc/data/stable_abi.dat
Some symbols from the limited API are missing: PyType_HasFeature
This error means that there are some missing symbols among the ones exported
in the Python library ("libpythonx.x.a" or "libpythonx.x.so"). This normally
means that some symbol, function implementation or a prototype, belonging to
a symbol in the limited API has been deleted or is missing.
Check if this was a mistake and if not, update the file containing the limited
API symbols. This file is located at:
./Doc/data/stable_abi.dat
You can read more about the limited API and its contracts at:
https://docs.python.org/3/c-api/stable.html
And in PEP 384:
https://www.python.org/dev/peps/pep-0384/