Test Python 3.13 and PyPy 3.10

[kurtmckee]

Exactly what it says on the tin.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.48%. Comparing base (7e6ec66) to head (128cb74).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #371   +/-   ##
=======================================
  Coverage   89.48%   89.48%           
=======================================
  Files          36       36           
  Lines        1674     1674           
  Branches      205      205           
=======================================
  Hits         1498     1498           
  Misses        143      143           
  Partials       33       33           

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[anishathalye]

Thank you!