ci: use a version of Python that node-sass can be built on for macOS

[G-Rath]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

It seems like there isn't a precompiled version of node-sass available for macos-latest, and node-gpy then fails to build it from source due to the version not being compatible with Python 3.12.

It seems like this might be the last straw for node-sass but in the meantime we can work around this by just explicitly installing an older version of Python when running on macos-latest.

Breaking Changes

This is not a breaking change

Additional Info

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.93%. Comparing base (31789cc) to head (9cb327d).
Report is 11 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1215      +/-   ##
==========================================
- Coverage   94.44%   93.93%   -0.52%     
==========================================
  Files           3        3              
  Lines         360      412      +52     
  Branches      132      153      +21     
==========================================
+ Hits          340      387      +47     
- Misses         18       23       +5     
  Partials        2        2              

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[evenstensberg]

lgtm!