Support Python 3.12

[mhostetter]

Fixes #525

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (529ba26) 96.43% compared to head (b7fb490) 96.44%.
Report is 2 commits behind head on release/0.3.x.

Additional details and impacted files

@@                Coverage Diff                @@
##           release/0.3.x     #534      +/-   ##
=================================================
+ Coverage          96.43%   96.44%   +0.01%     
=================================================
  Files                 46       46              
  Lines               5911     5911              
=================================================
+ Hits                5700     5701       +1     
+ Misses               211      210       -1     

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