change saving to pathlib

[mastoffel]

saving models now with pathlib and a bit more robust.

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
autoemulate
save.py					63-65, 104
tests
test_save.py
Project Total

This report was generated by python-coverage-comment-action

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.25000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 90.61%. Comparing base (aa81a13) to head (a1764a6).
Report is 5 commits behind head on main.

Files	Patch %	Lines
autoemulate/save.py	85.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #204      +/-   ##
==========================================
- Coverage   90.68%   90.61%   -0.07%     
==========================================
  Files          45       45              
  Lines        2264     2269       +5     
==========================================
+ Hits         2053     2056       +3     
- Misses        211      213       +2     

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