Add support for Python 3.13

[nsoranzo]

Fix #223 .

[nsoranzo]

Ready for review, the unit test failures are all unrelated (codecov upload errors).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.27%. Comparing base (59c4cc4) to head (0512fd5).
Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #224   +/-   ##
=======================================
  Coverage   81.27%   81.27%           
=======================================
  Files           8        8           
  Lines         785      785           
  Branches      199      199           
=======================================
  Hits          638      638           
  Misses        111      111           
  Partials       36       36           

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