Add support for python 3.13

[jasper-jager]

The dockerfile has been fixed to use python 3.9 to be able to run the tests, this had been broken for quite some time.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.03%. Comparing base (2da5385) to head (406dc9d).
Report is 60 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #38      +/-   ##
==========================================
- Coverage   88.27%   88.03%   -0.25%     
==========================================
  Files          39       39              
  Lines        3626     3827     +201     
==========================================
+ Hits         3201     3369     +168     
- Misses        425      458      +33     

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