Update sphinx requirement from ~=8.1.3 to ~=8.2.1

[dependabot]

Updates the requirements on sphinx to permit the latest version.

Release notes

Sourced from sphinx's releases.

Sphinx 8.2.1

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

Changelog

Sourced from sphinx's changelog.

Release 8.2.1 (released Feb 21, 2025)

Bugs fixed

• #13367: Correct spelling of highlighting_failure in warning sub-type. Patch by Bart Kamphorst.
• #13377: Restore support for using sphinx.testing.path paths with sphinx.testing.fixtures. Patch by Kazuya Takei.
• #13380: viewcode: Fix importing modules more than once. Patch by Dave Hoese.
• #13382: Napoleon: Use the right valid types for configuration values. Patch by Adam Turner.
• 13376: Fix copying assets from a relative :confval:html_static_path entry. Patch by Adam Turner.

Release 8.2.0 (released Feb 18, 2025)

Dependencies

• #13000: Drop Python 3.10 support.

Incompatible changes

• #13044: Remove the internal and undocumented has_equations data from the :py:class:!MathDomain domain. The undocumented :py:meth:!MathDomain.has_equations method now unconditionally returns True. These are replaced by the has_maths_elements key of the page context dict. Patch by Adam Turner.
• #13227: HTML output for sequences of keys in the :rst:role:kbd role no longer uses a <kbd class="kbd compound"> element to wrap the keys and separators, but places them directly in the relevant parent node. This means that CSS rulesets targeting kbd.compound or .kbd.compound will no longer have any effect. Patch by Adam Turner.

Deprecated

• #13037: Deprecate the SingleHTMLBuilder.fix_refuris method. Patch by James Addison.
• #13083, #13330: Un-deprecate sphinx.util.import_object. Patch by Matthias Geier.

... (truncated)

Commits

• 0215a73 Bump to 8.2.1 final
• 53b7913 Remove background colours from (un)translated classes
• 58e64d4 Fix _relative_path() for unresolved paths
• 1a3d1de Add missing CHANGES entry
• d847d73 Bump Ruff to 0.9.7
• 7ba7628 Napoleon: Fix valid types for configuration values (#13382)
• 8ef0708 Fix viewcode extension importing modules more than once (#13380)
• 7e1bf28 Restore support for sphinx.testing.path paths in ``sphinx.testing.fixture...
• d099161 Revert "Mark autodoc singledispatchmethod tests as expected failures" (#13381)
• ba3c729 Switch transifex workflow trigger from 'push' to 'pull_request'
• Additional commits viewable in compare view

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