Update sphinx requirement from ~=3.1 to ~=7.2

[dependabot[bot]]

Updates the requirements on sphinx to permit the latest version.

Release notes

Sourced from sphinx's releases.

Sphinx 7.2.6

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

Changelog

Sourced from sphinx's changelog.

Release 7.2.6 (released Sep 13, 2023)

Bugs fixed

• #11679: Add the :envvar:!SPHINX_AUTODOC_RELOAD_MODULES environment variable, which if set reloads modules when using autodoc with TYPE_CHECKING = True. Patch by Matt Wozniski and Adam Turner.
• #11679: Use :py:func:importlib.reload to reload modules in autodoc. Patch by Matt Wozniski and Adam Turner.

Release 7.2.5 (released Aug 30, 2023)

Bugs fixed

• #11645: Fix a regression preventing autodoc from importing modules within packages that make use of if typing.TYPE_CHECKING: to guard circular imports needed by type checkers. Patch by Matt Wozniski.
• #11634: Fixed inheritance diagram relative link resolution for sibling files in a subdirectory. Patch by Albert Shih.
• #11659: Allow ?config=... in :confval:mathjax_path.
• #11654: autodoc: Fail with a more descriptive error message when an object claims to be an instance of type, but is not a class. Patch by James Braza.
• 11620: Cease emitting :event:source-read events for files read via the :dudir:include directive.
• 11620: Add a new :event:include-read for observing and transforming the content of included files via the :dudir:include directive.
• #11627: Restore support for copyright lines of the form YYYY when SOURCE_DATE_EPOCH is set.

Release 7.2.4 (released Aug 28, 2023)

Bugs fixed

• #11618: Fix a regression in the MoveModuleTargets transform, introduced in #10478 (#9662).
• #11649: linkcheck: Resolve hanging tests for timezones west of London and incorrect conversion from UTC to offsets from the UNIX epoch. Patch by Dmitry Shachnev and Adam Turner.

Release 7.2.3 (released Aug 23, 2023)

... (truncated)

Commits

• cf7d275 Bump to 7.2.6 final
• 43d6975 Leverage importlib.reload for reloading modules (#11679)
• 13da5d7 Inline makecmd in make mode
• 3d0110a Enable test_cython on Python 3.12
• 22759fb Bump version
• fcc3899 Bump to 7.2.5 final
• 2a631f9 Restore support for YYYY copyright lines
• 2730cc3 Remove double spaces in CHANGES
• ff18318 Add an 'include-read' event (#11657)
• 74329d9 Fail better in ExceptionDocumenter.can_document_member (#11660)
• Additional commits viewable in compare view

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