Fixes to build system and removing deprecated functions

[phoebe-p]

• Fixed deprecated Numpy functions
• Changes testing workflow to remove old Python versions (now testing 3.9 - 3.12)
• Update Github actions versions
• Use a specific version of spin (0.9) which does not cause issues with the --ignore flag for including test_examples.py
• remove S4 installation for MacOS ARM/M1, since this no longer works for some reason (complaining about not finding boost header files even when homebrew path is explicitly linked in Makefile.m1)
• Changes to phoebe-p/S4 to stop compiler errors with Interpolator type
• Increase relative allowed error in approximate comparisons for tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.24%. Comparing base (7765b27) to head (3f940e3).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #278   +/-   ##
========================================
  Coverage    60.23%   60.24%           
========================================
  Files          108      108           
  Lines        12361    12358    -3     
========================================
- Hits          7446     7445    -1     
+ Misses        4915     4913    -2     

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