Update python support

[vwiela]

As seen in #1378 petab tests are failing due to use of syntax in AMICI that is not supported in python version <=3.9.

I guess, we should think about dropping the python support for python <=3.9. Other packages as numpy already dropped support for 3.9 as well. https://numpy.org/neps/nep-0029-deprecation_policy.html

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.48%. Comparing base (e197a8b) to head (e9abff6).

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1379      +/-   ##
===========================================
+ Coverage    81.32%   84.48%   +3.15%     
===========================================
  Files          157      157              
  Lines        12933    12932       -1     
===========================================
+ Hits         10518    10925     +407     
+ Misses        2415     2007     -408     

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