Declare Python 3.13 support

[bdraco]

Add a classifier for Python 3.13 and start testing on Python 3.13

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.75%. Comparing base (059acdf) to head (1cb0332).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #927   +/-   ##
=======================================
  Coverage   80.75%   80.75%           
=======================================
  Files          24       24           
  Lines        1434     1434           
  Branches      206      206           
=======================================
  Hits         1158     1158           
  Misses        184      184           
  Partials       92       92           

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