Add Python 3.11 to CI

[prisae]

A PR, simple to re-run and see when it starts to pass...

[codecov-commenter]

Codecov Report

Merging #99 (0e830c1) into main (5679988) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #99   +/-   ##
=======================================
  Coverage   85.61%   85.61%           
=======================================
  Files           5        5           
  Lines         424      424           
=======================================
  Hits          363      363           
  Misses         61       61           

[prisae]

Tests for Python 3.11 pass now, so I merge this. The failing linting is not related to this PR.

[banesullivan]

Looks like it's passing!

Though some odd error from pre-commit...