Support Python 3.13, drop support for Python 3.8

[fizyk]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.78%. Comparing base (e928db2) to head (d720e07).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #614   +/-   ##
=======================================
  Coverage   99.78%   99.78%           
=======================================
  Files          11       11           
  Lines         470      470           
=======================================
  Hits          469      469           
  Misses          1        1           

Flag	Coverage Δ
unittests	99.78% <ø> (ø)

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