Enable Python 3.12 in CI

[jstasiak]

It's been out for a while. The change is needed to make sure we don't become unwillingly incompatible.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.22%. Comparing base (78bb621) to head (76ab6a1).
Report is 6 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #260   +/-   ##
=======================================
  Coverage   95.22%   95.22%           
=======================================
  Files           1        1           
  Lines         565      565           
  Branches       96       96           
=======================================
  Hits          538      538           
  Misses         20       20           
  Partials        7        7           

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