Test Python 3.13 beta

[hugovk]

The 3.13 beta is out, time to start testing: https://discuss.python.org/t/python-3-13-0b1-now-available/52891

cibuildwheel isn't quite ready for 3.13.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.34%. Comparing base (04daf02) to head (7a89716).

❗ Current head 7a89716 differs from pull request most recent head 7c0f425. Consider uploading reports for the commit 7c0f425 to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #627   +/-   ##
=======================================
  Coverage   92.34%   92.34%           
=======================================
  Files           6        6           
  Lines        1908     1908           
=======================================
  Hits         1762     1762           
  Misses        146      146           

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