pip check fails in 2021.12

[trz42]

Some package in the compatibility layer of 2021.12 is missing as reported by pip check. Reproduce as follows

$ source /cvmfs/pilot.eessi-hpc.org/versions/2021.12/init/bash
...
$ pip check
gitpython 3.1.24 requires typing-extensions, which is not installed.

The problem has actually been reported to gentoo, see https://bugs.gentoo.org/827882
The fix, however, was not used to bootstrap the prefix. It seems the specific commit being used (gentoo/gentoo@7eaa251) is two days too old.

It might be possible to fix this with an in-place update of the package.

[boegel]

We should probably add pip check to the tests that are run for the compat layer, because EasyBuild relies on pip check during the sanity check of Python packages...

[boegel]

@bedroge We should fix this by updating dev-python/GitPython?

Thanks to #164 we've jumped to a newer gentoo commit, so should be possible now...

[boegel]

Just for the record: this is not a problem anymore in EESSI pilot 2023.04:

$ /cvmfs/pilot.eessi-hpc.org/versions/2023.04/compat/linux/$(uname -m)/startprefix
Entering Gentoo Prefix /cvmfs/pilot.eessi-hpc.org/versions/2023.04/compat/linux/x86_64
$ which python3
/cvmfs/pilot.eessi-hpc.org/versions/2023.04/compat/linux/x86_64/usr/bin/python3

$ unset PYTHONPATH
$ python3 -m pip check
No broken requirements found.

[boegel]

Same result for EESSI 2023.06, since https://bugs.gentoo.org/827882 was fixed:

$ /cvmfs/pilot.eessi-hpc.org/versions/2023.06/compat/linux/x86_64/startprefix
Entering Gentoo Prefix /cvmfs/pilot.eessi-hpc.org/versions/2023.06/compat/linux/x86_64
$ which python3
/cvmfs/pilot.eessi-hpc.org/versions/2023.06/compat/linux/x86_64/usr/bin/python3
$ python3 -V
Python 3.11.4
$ unset PYTHONPATH
$ python3 -m pip check
No broken requirements found.

So closing this issue (there's little point in fixing this for 2021.12 imho)