[WIP]: ci: add Python 3.13 to CI matrix; build: declare support for 3.13

[henrykironde]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.54%. Comparing base (84d9737) to head (6e7424a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1157   +/-   ##
=======================================
  Coverage   86.54%   86.54%           
=======================================
  Files          20       20           
  Lines        2609     2609           
=======================================
  Hits         2258     2258           
  Misses        351      351           

Flag	Coverage Δ
unittests	86.54% <ø> (ø)

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