Fix TypeError in JAXProblem._get_measurements

[dweindl]

Use pandas 2.x & 3.x compatible check for string dtypes.

Fixes #3120.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.22%. Comparing base (ab5f225) to head (0f92644).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3122   +/-   ##
=======================================
  Coverage   78.21%   78.22%           
=======================================
  Files         315      315           
  Lines       20482    20482           
  Branches     1484     1484           
=======================================
+ Hits        16021    16023    +2     
+ Misses       4453     4451    -2     
  Partials        8        8           

Flag	Coverage Δ
cpp	71.69% <100.00%> (-0.02%)	⬇️
cpp_python	37.85% <0.00%> (ø)
petab	46.56% <100.00%> (ø)
petab_sciml	13.93% <0.00%> (ø)
python	70.35% <100.00%> (+0.22%)	⬆️
sbmlsuite-jax	33.41% <0.00%> (ø)

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Files with missing lines	Coverage Δ
python/sdist/amici/jax/petab.py	94.00% <100.00%> (+0.27%)	⬆️

... and 5 files with indirect coverage changes

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