Explicit support for python 3.13

[kmnhan]

Closes #58

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.30%. Comparing base (cd397d8) to head (d4174bd).
Report is 2 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #73   +/-   ##
=======================================
  Coverage   83.30%   83.30%           
=======================================
  Files          82       82           
  Lines       14324    14324           
=======================================
  Hits        11933    11933           
  Misses       2391     2391           

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