CI: Set random seed in flaky test_jax.py::test_conversion and test_sbml_import.py::test_likelihoods

[dweindl]

See https://github.com/AMICI-dev/AMICI/actions/runs/22374653249/job/64761962839

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.71%. Comparing base (7d74016) to head (b6da5bb).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3132      +/-   ##
==========================================
- Coverage   77.39%   76.71%   -0.68%     
==========================================
  Files         316      316              
  Lines       20632    20632              
  Branches     1483     1484       +1     
==========================================
- Hits        15968    15828     -140     
- Misses       4656     4796     +140     
  Partials        8        8              

Flag	Coverage Δ
cpp	70.44% <ø> (-0.03%)	⬇️
cpp_python	37.87% <ø> (ø)
petab	47.16% <ø> (ø)
python	68.90% <ø> (-0.03%)	⬇️
sbmlsuite-jax	?

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see 7 files with indirect coverage changes

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