Add support for Python 3.13

[hugovk]

3.13.0 alpha was recently released, let's see how it goes supporting it already.

• https://devguide.python.org/versions/
• https://peps.python.org/pep-0719/
• https://discuss.python.org/t/python-3-13-0-alpha-1/36109?u=hugovk

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6aa3670) 99.19% compared to head (d796fb0) 99.19%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #156   +/-   ##
=======================================
  Coverage   99.19%   99.19%           
=======================================
  Files           9        9           
  Lines         747      747           
=======================================
  Hits          741      741           
  Misses          6        6           

Flag	Coverage Δ
macos-latest	97.59% <ø> (ø)
ubuntu-latest	97.59% <ø> (ø)
windows-latest	96.11% <ø> (ø)

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