Require swig>=4.1

[dweindl]

SWIG 4.1 has been released in 2022. It should be safe to require SWIG>=4.1.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.98%. Comparing base (a87058e) to head (c1bf1b3).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2693      +/-   ##
===========================================
+ Coverage    77.86%   77.98%   +0.12%     
===========================================
  Files          332      332              
  Lines        23001    23001              
  Branches      1480     1480              
===========================================
+ Hits         17909    17937      +28     
+ Misses        5081     5053      -28     
  Partials        11       11              

Flag	Coverage Δ
cpp	77.14% <ø> (+2.34%)	⬆️
cpp_python	33.61% <ø> (ø)
petab	39.41% <ø> (ø)
python	73.02% <ø> (+0.13%)	⬆️

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see 5 files with indirect coverage changes

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