Add support for Python 3.13

[hugovk]

• https://devguide.python.org/versions/
• https://peps.python.org/pep-0719/
• https://pyreadiness.org/3.13/

[codecov[bot]]

Codecov Report

Merging #177 (ddc6146) into main (de0738b) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #177   +/-   ##
=======================================
  Coverage   98.97%   98.97%           
=======================================
  Files           7        7           
  Lines         390      390           
=======================================
  Hits          386      386           
  Misses          4        4           

Flag	Coverage Δ
macos-latest	98.97% <ø> (ø)
ubuntu-latest	98.97% <ø> (ø)
windows-latest	98.97% <ø> (ø)

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