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 are part of the latest version (since the 1.10.1 release).

Ready to be merged as soon as numba releases 0.61.

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 --> require RC pynbody, but that's fine
• Windows works, but numba can't be installed currently. But should work.
• Wheels:
  • Build Python 3.13 wheels for all platforms

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.91%. Comparing base (bb31762) to head (13a036f).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##             main     #673     +/-   ##
=========================================
  Coverage   99.90%   99.91%             
=========================================
  Files         200      202      +2     
  Lines       29430    30823   +1393     
  Branches      564      655     +91     
=========================================
+ Hits        29403    30796   +1393     
  Misses         27       27             

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