MAINT: adding python 3.13 to the tests

[bsipocz]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.29%. Comparing base (7673171) to head (7cdd1c8).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #191   +/-   ##
=======================================
  Coverage   90.29%   90.29%           
=======================================
  Files          30       30           
  Lines        1206     1206           
=======================================
  Hits         1089     1089           
  Misses        117      117           

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[pllim]

Does look cleaner than '3.13-dev'. Thanks!