add python 3.12 to CI tests

[rkingsbury]

Adds python 3.12 to the CI test matrix.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.83%. Comparing base (428afd6) to head (d5188e5).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #992   +/-   ##
=======================================
  Coverage   88.83%   88.83%           
=======================================
  Files          46       46           
  Lines        3985     3985           
=======================================
  Hits         3540     3540           
  Misses        445      445           

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