Update sphinx requirement from <8.2.0 to <9.1.0

[dependabot[bot]]

Updates the requirements on sphinx to permit the latest version.

Release notes

Sourced from sphinx's releases.

Sphinx 9.0.1

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

Bugs fixed

• #13942: autodoc: Restore the mapping interface for options objects. Patch by Adam Turner.
• #13942: autodoc: Deprecate the mapping interface for options objects. Patch by Adam Turner.
• #13387: Update translations.

Changelog

Sourced from sphinx's changelog.

Release 9.0.1 (released Dec 01, 2025)

Bugs fixed

• #13942: autodoc: Restore the mapping interface for options objects. Patch by Adam Turner.
• #13942: autodoc: Deprecate the mapping interface for options objects. Patch by Adam Turner.
• #13387: Update translations.

Release 9.0.0 (released Nov 30, 2025)

Dependencies

• #13786: Support Docutils 0.22_. Patch by Adam Turner.

  .. _Docutils 0.22: https://docutils.sourceforge.io/RELEASE-NOTES.html#release-0-22-2026-07-29

Incompatible changes

• #13639: :py:meth:!SphinxComponentRegistry.create_source_parser no longer has an app parameter, instead taking config and env. Patch by Adam Turner.
• #13679: Non-decodable characters in source files now raise an error. Such bytes have been replaced with '?' along with logging a warning since Sphinx 2.0. Patch by Adam Turner.
• #13751, #14089: :mod:sphinx.ext.autodoc has been substantially rewritten, and there may be some incompatible changes in edge cases, especially when extensions interact with autodoc internals. The :confval:autodoc_use_legacy_class_based option has been added to use the legacy (pre-9.0) implementation of autodoc. Patches by Adam Turner.
• #13355: Don't include escaped title content in the search index. Patch by Will Lachance.

Deprecated

• 13627: Deprecate remaining public :py:attr:!.app attributes, including builder.app, env.app, events.app, and SphinxTransform.app. Patch by Adam Turner.
• #13637: Deprecate the :py:meth:!set_application method of :py:class:~sphinx.parsers.Parser objects.

... (truncated)

Commits

• a837378 Bump to 9.0.1 final
• 48840e6 Note updated message catalogues in CHANGES
• 5931339 [bot]: Update message catalogues (#13387)
• baffcf0 autodoc: Deprecate mapping interface for options (#14140)
• 61f9b70 Bump mypy to 1.19.0 (#14135)
• ded587e Shrink mypy whitelist for tests.test_directives.test_directive_patch (#14...
• a03556f Shrink mypy whitelist for tests.test_builders.test_build_latex (#14138)
• 0204145 linkcheck: Reduce test duration on Windows (#14133)
• 4e902a4 Bump Ruff to 0.14.7 (#14134)
• 9a11033 Bump version
• Additional commits viewable in compare view

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