Minor bug fixes

[arrjon]

Some minor bug fixes. These should be corrected in the main version too.

[arrjon]

Something with the petab seems to be the problem, working on it

[stephanmg]

@arrjon not sure what's the issue, thanks for spending time to debug this.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 75.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 84.30%. Comparing base (a322de3) to head (b0a1347).
Report is 39 commits behind head on main.

Files with missing lines	Patch %	Lines
pyabc/petab/__init__.py	60.00%	2 Missing ⚠️
pyabc/transition/local_transition.py	50.00%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #639      +/-   ##
==========================================
- Coverage   84.35%   84.30%   -0.06%     
==========================================
  Files         141      141              
  Lines        8535     8544       +9     
==========================================
+ Hits         7200     7203       +3     
- Misses       1335     1341       +6     

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[arrjon]

I changed the oldest python version from python 3.9 to 3.10 and updated the GitHub continous integration workflow. This helped with most of the failing tests.

[arrjon]

Adding | string to env.doc2path() forces Jinja2 to interpret the result as a string, which avoids _StrPath type issues in templates. This should resolve the TypeError by ensuring all path-related operations in nbsphinx_prolog handle paths as strings.

[arrjon]

In the migration test, incompatible numpy and pandas versions caused an error. This is fixed now.

[arrjon]

@stephanmg you can review now: only some tests for older python versions are sill in the status "expected" and never leave it (I think because they were part of the old CI workflow, but have been removed).

[stephanmg]

Only minor comments, fixes look good to me. Thanks for the PR.