Set default python version to 3.12 in tests

[AdrianDAlessandro]

Description

This is to test if issue #329 can be reproduced

Type of change

• Documentation (non-breaking change that adds or improves the documentation)
• New feature (non-breaking change which adds functionality)
• Optimization (non-breaking, back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (whatever its nature)

Key checklist

• All tests pass (eg. python -m pytest)
• The documentation builds and looks OK (eg. python -m sphinx -b html docs docs/build)
• Pre-commit hooks run successfully (eg. pre-commit run --all-files)

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added or an issue has been opened to tackle that in the future. (Indicate issue here: # (issue))

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.96%. Comparing base (b5779c1) to head (50796cc).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #332      +/-   ##
==========================================
+ Coverage   86.91%   86.96%   +0.04%     
==========================================
  Files          22       22              
  Lines        2217     2217              
  Branches      280      280              
==========================================
+ Hits         1927     1928       +1     
  Misses        214      214              
+ Partials       76       75       -1     

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[barneydobson]

Closing this for now, as even with the CLI test #333 these still pass in 3.12