Update sphinx requirement from <7.4.6 to <8.2.4 in the dev-dependencies group

[dependabot]

Updates the requirements on sphinx to permit the latest version.
Updates sphinx to 8.2.3

Release notes

Sourced from sphinx's releases.

Sphinx 8.2.3

Changelog: https://www.sphinx-doc.org/en/master/changes/8.2.html

Commits

• 847ad0c Bump to 8.2.3 final
• 4091fe3 Add CHANGES for Sphinx 8.2.3
• c84c21f Correct the date for Sphinx 8.2.2
• b3881bb Fix _CurrentDocument membership testing with '{c,cpp}:parent_symbol'
• 92b5303 Define _StrPath.__radd__()
• 5739a9d Bump version
• ee96ef3 Bump to 8.2.2 final
• 3e0021c Move Sphinx 8.2.2 CHANGES to doc/changes
• 1a62f31 Fix apidoc extension not setting default header/package name (#13391)
• 13d2899 Replace None filename with '' in Sphinx.add_js_file() (#13402)
• Additional commits viewable in compare view

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.98%. Comparing base (c7f3ae3) to head (aa497e2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1096   +/-   ##
=======================================
  Coverage   97.98%   97.98%           
=======================================
  Files         199      199           
  Lines        7686     7686           
=======================================
  Hits         7531     7531           
  Misses        155      155           

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[callumforrester]

Given the docs build I think we should merge

[DominicOram]

I think we still care about the linked comment at sphinx-doc/sphinx#12660 (comment). No @rtuck99? This has been hanging around for ages though so I suggest we either find a work around our side or fix it for them