Add support for Python 3.12

[sebp]

Checklist

• pytest passes
• tests are included
• code is well formatted
• documentation renders correctly

What does this implement/fix? Explain your changes
Adds support for Python 3.12

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (66b7efb) 98.04% compared to head (d5a6f5c) 97.98%.
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #422      +/-   ##
==========================================
- Coverage   98.04%   97.98%   -0.06%     
==========================================
  Files          37       37              
  Lines        3426     3426              
  Branches      517      517              
==========================================
- Hits         3359     3357       -2     
- Misses         32       33       +1     
- Partials       35       36       +1     

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