Update for Python 3.13

[d-chris]

Test with pytest ^8.3.3 for python 3.13

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.55%. Comparing base (b9f5a07) to head (f3fb9a0).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
- Coverage   97.78%   93.55%   -4.23%     
==========================================
  Files           6        6              
  Lines         541      574      +33     
==========================================
+ Hits          529      537       +8     
- Misses         12       37      +25     

Flag	Coverage Δ
unittests	93.55% <ø> (-4.23%)	⬇️

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