Add support for Python 3.14 and test PyPy3.11

[hugovk]

• https://devguide.python.org/versions/
• https://peps.python.org/pep-0745/
• https://pypy.org/posts/2025/02/pypy-v7318-release.html

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.49%. Comparing base (c6455cf) to head (ec33490).
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #235   +/-   ##
=======================================
  Coverage   99.49%   99.49%           
=======================================
  Files          11       11           
  Lines         785      785           
=======================================
  Hits          781      781           
  Misses          4        4           

Flag	Coverage Δ
macos-latest	97.70% <ø> (ø)
ubuntu-latest	97.70% <ø> (ø)
windows-latest	95.92% <ø> (ø)

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