Add support for Python 3.15

[hugovk]

Currently in alpha:

• https://devguide.python.org/versions/
• https://peps.python.org/pep-0790/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.51%. Comparing base (38c9968) to head (2fb7252).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@ ## main #275 +/- ## ======================================= Coverage 99.51% 99.51% ======================================= Files 11 11 Lines 820 820 ======================================= Hits 816 816 Misses 4 4 

Flag	Coverage Δ
macos-latest	97.80% <ø> (ø)
ubuntu-latest	97.80% <ø> (ø)
windows-latest	95.85% <ø> (ø)

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