feat: add Python 3.13 support

[bdraco]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.86%. Comparing base (75722e0) to head (1adf221).
Report is 15 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #55   +/-   ##
=======================================
  Coverage   35.86%   35.86%           
=======================================
  Files           7        7           
  Lines         435      435           
  Branches       80       44   -36     
=======================================
  Hits          156      156           
- Misses        277      279    +2     
+ Partials        2        0    -2     

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