Add Python 3.13 support

[jobovy]

This issue just tracks progress to fully changing the build/test infrastructure to Python 3.13. Python 3.13 wheels were already added in #674 and will be part of the next 1.10.1 release.

This PR tracks progress towards fully supporting Python 3.13. Any necessary fixes will be done separately outside of this PR, so actual Python 3.13 support can be achieved for many platforms before achieving it for all. We believe, in fact, that galpy fully works, but it is hard to fully test until all dependencies support Python 3.13.

Current status:

• Linux works almost 100%, but can't run tests dependent on JAX or numba, because they do not support Python 3.13 yet. This affects only the spherical DFs (for JAX) and the non-inertial-frame force tests. There appears to be an issue with use of pynbody in SnapshotRZPotential
  • Fix SnapshotRZPotential ``pynbody` issue
  • Test JAX-dependent code
  • Test numba-dependent code
• Mac does not work because of an issue with installing pynbody from source, but we believe it's status is the same as Linux.
  • run Mac tests
• Windows works
• Wheels:
  • Build Python 3.13 wheels for all platforms

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.75%. Comparing base (2d78942) to head (a580476).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #673      +/-   ##
==========================================
- Coverage   99.91%   97.75%   -2.16%     
==========================================
  Files         200      200              
  Lines       29325    29325              
  Branches      563      564       +1     
==========================================
- Hits        29299    28666     -633     
- Misses         26      659     +633     

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