Support Python 3.13

[michael-k]

Issue #, if available: n/a

Description of changes: Run tests against Python 3.13 and add trove classifier.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.75%. Comparing base (0d7df03) to head (2fac956).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3765      +/-   ##
==========================================
- Coverage   93.76%   93.75%   -0.01%     
==========================================
  Files         362      362              
  Lines       12353    12353              
  Branches     2520     2520              
==========================================
- Hits        11583    11582       -1     
  Misses        429      429              
- Partials      341      342       +1     

Flag	Coverage Δ
unittests	93.71% <ø> (-0.01%)	⬇️

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