Fix type annotations in swig-wrappers (again)

[dweindl]

Some things were missing in #2344

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 77.66%. Comparing base (8d65524) to head (1388009).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2365      +/-   ##
===========================================
- Coverage    77.66%   77.66%   -0.01%     
===========================================
  Files          324      324              
  Lines        20825    20824       -1     
  Branches      1454     1454              
===========================================
- Hits         16174    16173       -1     
  Misses        4648     4648              
  Partials         3        3              

Flag	Coverage Δ
cpp	73.43% <0.00%> (-0.01%)	⬇️
cpp_python	34.25% <0.00%> (-0.01%)	⬇️
petab	36.86% <0.00%> (-0.01%)	⬇️
python	72.22% <0.00%> (-0.01%)	⬇️
sbmlsuite	?

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Files	Coverage Δ
python/sdist/amici/swig.py	10.52% <0.00%> (ø)

... and 1 file with indirect coverage changes