Fix scripts test stability

[kratman]

Description

I noticed that on my Mac nox -s scripts and pytest tests both failed with this error:

tests/test_scripts.py::TestExamples::test_example_scripts[multiprocess_jax_solver.py] - AttributeError: 'PosixPath' object has no attribute 'startswith'

The changes in this PR make it work locally for me.

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #)

Important checks:

Please confirm the following before marking the PR as ready for review:

• No style issues: nox -s pre-commit
• All tests pass: nox -s tests
• The documentation builds: nox -s doctests
• Code is commented for hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[kratman]

For me PyCharm also showed inspection errors:

• list_of_files() was marked as being static
• list_of_files() was marked as missing an argument
• runpy.run_path(files) was marked as having the wrong type for the function

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.70%. Comparing base (e39d72e) to head (e6db2f5).
Report is 4 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #4849   +/-   ##
========================================
  Coverage    98.70%   98.70%           
========================================
  Files          303      304    +1     
  Lines        23353    23432   +79     
========================================
+ Hits         23050    23129   +79     
  Misses         303      303           

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