Add python 3.12 to CI

[joezuntz]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.72%. Comparing base (e09492c) to head (48f7fdf).
Report is 4 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #144      +/-   ##
==========================================
+ Coverage   60.65%   61.72%   +1.06%     
==========================================
  Files         117      117              
  Lines       12393    12405      +12     
==========================================
+ Hits         7517     7657     +140     
+ Misses       4876     4748     -128     

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