Fix test/petab/test_amici_predictor.py failures

[dweindl]

Fixes recent test failures probably related to the recent swig-4.4.1:

>           testmodel.setFixedParameters(amici.DoubleVector(fp))

test/petab/test_amici_predictor.py:131:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <amici.amici.ModelPtr; proxy of <Swig Object of type 'std::unique_ptr< amici::Model > *' at 0x7f719c1d4970> >
k = <Swig Object of type 'std::vector< double > *' at 0x7f719e83ad30; array([2., 0.]) >

    def setFixedParameters(self, k: Sequence[float]):
        """
        Set values for constants.
        :param k: Vector of fixed parameters
        """
>       return _amici.ModelPtr_setFixedParameters(self, k)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
E       TypeError: in method 'ModelPtr_setFixedParameters', argument 2 of type 'std::vector< amici::realtype,std::allocator< amici::realtype > > const &'

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.34%. Comparing base (c5acea7) to head (c67de39).
⚠️ Report is 1 commits behind head on develop.
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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1672      +/-   ##
===========================================
- Coverage    84.36%   84.34%   -0.03%     
===========================================
  Files          164      164              
  Lines        14320    14320              
===========================================
- Hits         12081    12078       -3     
- Misses        2239     2242       +3     

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