Update versioneer to 0.21

[opoplawski]

Should fix build with python 3.11, see https://bugzilla.redhat.com/show_bug.cgi?id=2028105

[pep8speaks]

Hello @opoplawski! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file src/pytest_mpi/_version.py:

Line 342:80: E501 line too long (84 > 79 characters)
Line 432:80: E501 line too long (80 > 79 characters)
Line 435:80: E501 line too long (82 > 79 characters)

• In the file versioneer.py:

Line 194:80: E501 line too long (87 > 79 characters)
Line 196:80: E501 line too long (86 > 79 characters)
Line 224:80: E501 line too long (85 > 79 characters)
Line 255:80: E501 line too long (87 > 79 characters)
Line 257:80: E501 line too long (83 > 79 characters)
Line 259:80: E501 line too long (86 > 79 characters)
Line 664:80: E501 line too long (81 > 79 characters)
Line 758:80: E501 line too long (85 > 79 characters)
Line 848:80: E501 line too long (80 > 79 characters)
Line 851:80: E501 line too long (85 > 79 characters)
Line 1276:80: E501 line too long (84 > 79 characters)
Line 1473:80: E501 line too long (80 > 79 characters)
Line 1476:80: E501 line too long (82 > 79 characters)
Line 1746:80: E501 line too long (83 > 79 characters)

[aragilar]

Sorry for not responding sooner, looks like I'll need to update the CI config so that it runs correctly. I'm slightly concerned about some of the paths changing, I'll need to do some local tests to confirm they're fine.

[aragilar]

Thanks @opoplawski, I've rebased (so that the CI ran) and merged this. I'll look at making a new release.