Test Python 3.13 in CI

[sydney-runkle]

Closes #471

[cloudflare-workers-and-pages]

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[alexmojaki]

Also add to pyproject.tomls. Maybe other files that I'm not thinking of.

[sydney-runkle]

Sure thing. Working off of pydantic/pydantic#9743 somewhat.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (f620780) to head (a499b7b).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #475   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          131       131           
  Lines         9783      9783           
  Branches      1290      1290           
=========================================
  Hits          9783      9783           

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[Kludex]

Depends on #480

[sydney-runkle]

Going to close and reopen against main with a cleaner commit sequence.