Require Python 3.11

[dweindl]

https://numpy.org/neps/nep-0029-deprecation_policy.html#drop-schedule:

On Apr 04, 2025 drop support for Python 3.10 (initially released on Oct 04, 2021)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.88%. Comparing base (57d8179) to head (faa12b4).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2692      +/-   ##
===========================================
- Coverage    77.95%   77.88%   -0.08%     
===========================================
  Files          327      327              
  Lines        23043    23043              
  Branches      1479     1479              
===========================================
- Hits         17964    17947      -17     
- Misses        5068     5085      +17     
  Partials        11       11              

Flag	Coverage Δ
cpp	74.74% <ø> (-0.08%)	⬇️
cpp_python	33.61% <ø> (ø)
petab	39.41% <ø> (ø)
python	72.94% <ø> (-0.08%)	⬇️

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see 3 files with indirect coverage changes

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