Compatibility with Sphinx 9

[AA-Turner]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.10%. Comparing base (bcdcf4f) to head (812e9c0).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #477   +/-   ##
=======================================
  Coverage   82.10%   82.10%           
=======================================
  Files          65       65           
  Lines        8654     8654           
=======================================
  Hits         7105     7105           
  Misses       1549     1549           

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[2bndy5]

This essentially prepares for Sphinx v9 support.

I'll be submitting another PR to update lock files, CI, noxfile, tests, and pyproject.toml. However, uv cannot currently rectify using sphinx v9 with myst-parser (for the docs group) because they also have not updated their support for sphinx v9.

[2bndy5]

However, uv cannot currently rectify using sphinx v9 with myst-parser (for the docs group) because they also have not updated their support for sphinx v9.

I'm watching executablebooks/MyST-Parser#1076 for updates in regard to MyST support of sphinx v9.