Support python 3.11

[pgarrison]

Part of #419

Before submitting

• Did you test your PR locally with pytest command?
• Did you run pre-commit hooks with pre-commit run -a command?

[pgarrison]

Tests pass on ubuntu 3.11 but time out on windows, which is a pre-existing bug #422, so I think this PR is good to go?

[benjijamorris]

Sweet! Thanks for doing this @pgarrison

[pgarrison]

I realize that without updating test-requirements.txt, these tests are running against the old dependencies.

[pgarrison]

Make requirements job seems to be failing confusingly

[KeyError]: 'Requires-Python'

[pgarrison]

This change now broke the 3.9 and 3.10 builds. I notice that the requirements files haven't been updated in 5 months, so it's possible that there's a bigger problem lurking.

[pgarrison]

Blocked by #424, closing for now