Add support for Python 3.13

[hugovk]

3.13.0 alpha 2 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-2/39379?u=hugovk

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (292fd25) 99.14% compared to head (20511f2) 99.14%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #56   +/-   ##
=======================================
  Coverage   99.14%   99.14%           
=======================================
  Files           4        4           
  Lines         233      233           
=======================================
  Hits          231      231           
  Misses          2        2           

Flag	Coverage Δ
macos-latest	99.14% <ø> (ø)
ubuntu-latest	99.14% <ø> (ø)
windows-latest	99.14% <ø> (ø)

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