Add Python 3.13 to the CI matrix

[jacebrowning]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.55%. Comparing base (c853fa5) to head (05d3234).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #689      +/-   ##
===========================================
+ Coverage    96.53%   96.55%   +0.02%     
===========================================
  Files           40       40              
  Lines         5229     5231       +2     
  Branches       981     1231     +250     
===========================================
+ Hits          5048     5051       +3     
  Misses         106      106              
+ Partials        75       74       -1     

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