Update sphinx requirement from ==2.3.* to ==8.1.*

[dependabot[bot]]

Updates the requirements on sphinx to permit the latest version.

Release notes

Sourced from sphinx's releases.

Sphinx 8.1.0

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

Changelog

Sourced from sphinx's changelog.

Release 8.1.0 (released Oct 10, 2024)

Dependencies

• #12756: Add lower-bounds to the sphinxcontrib-* dependencies. Patch by Adam Turner.
• #12833: Update the LaTeX parskip package from 2001 to 2018. Patch by Jean-François B.

Incompatible changes

• #12763: Remove unused internal class sphinx.util.Tee. Patch by Adam Turner.
• #12822: LaTeX: for Unicode engines, the :ref:fvset default is changed to '\\fvset{fontsize=auto}' from '\\fvset{fontsize=\\small}'. Code-blocks are unchanged as FreeMono is now loaded with Scale=0.9. An adjustment to existing projects is needed only if they used a custom :ref:fontpkg configuration and did not set :ref:fvset. Patch by Jean-François B.
• #12875: Disable smartquotes for languages: zh_CN and zh_TW by default. Patch by A. Rafey Khan.

Deprecated

• #12762: Deprecate sphinx.util.import_object. Use :py:func:importlib.import_module instead. Patch by Adam Turner.
• #12766: Deprecate sphinx.util.FilenameUniqDict and sphinx.util.DownloadFiles. Patch by Adam Turner.

Features added

• #11328: Mention evaluation of templated content during production of static output files. Patch by James Addison.
• #12704: LaTeX: make :dudir:contents <table-of-contents>, :dudir:topic, and :dudir:sidebar directives separately customizable for PDF output. Patch by Jean-François B. and Bénédikt Tran.
• #12474: Support type-dependent search result highlighting via CSS. Patch by Tim Hoffmann.
• #12652: LaTeX: Add :confval:math_numsep support to latex builder. Patch by Thomas Fanning and Jean-François B.
• #12743: No longer exit on the first warning when :option:--fail-on-warning <sphinx-build --fail-on-warning> is used.

... (truncated)

Commits

• 2f1d775 Bump to 8.1.0 final
• 668bb03 Partially revert "Update message catalogues (#12770)"
• 4f94cc6 [bot]: Update message catalogues (#12770)
• 283d863 Minor cleanup to autosectionlabel docs (#12992)
• 566d1cd Reword a paragraph in latex_table_style's documentation (#12994)
• fac1651 Bump pyright to 1.1.384 (#12990)
• d135d2e Mark Builder.write() as final (#12767)
• 705d5dd Convert latin_terms to a set (#12995)
• dcd276d Extract _feed_visit_nodes
• c87b758 Fix tests for Python 3.12.7 (#12993)
• Additional commits viewable in compare view

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