CI maintenance 2025-05

[amotl]

• CI: Validate on Python 3.13
• CI: Minor updates to GHA configuration

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 34.81%. Comparing base (087aed4) to head (b271f5e).
⚠️ Report is 40 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #175   +/-   ##
=======================================
  Coverage   34.81%   34.81%           
=======================================
  Files          24       24           
  Lines        1350     1350           
=======================================
  Hits          470      470           
  Misses        880      880           

Flag	Coverage Δ
unittests	34.81% <ø> (ø)

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