Update sphinx to 9.1.0

[pyup-bot]

This PR updates Sphinx from 1.7.2 to 9.1.0.

Changelog

9.1.0

==============================

Dependencies
------------

* 14153: Drop Python 3.11 support.
* 12555: Drop Docutils 0.20 support.
Patch by Adam Turner

Incompatible changes
--------------------

Deprecated
----------

Features added
--------------

* Add :meth:`~sphinx.application.Sphinx.add_static_dir` for copying static
assets from extensions to the build output.
Patch by Jared Dillard

Bugs fixed
----------

* 14189: autodoc: Fix duplicate ``:no-index-entry:`` for modules.
Patch by Adam Turner
* 13713: Fix compatibility with MyST-Parser.
Patch by Adam Turner
* Fix tests for Python 3.15.
Patch by Adam Turner
* 14089: autodoc: Fix default option parsing.
Patch by Adam Turner
* Remove incorrect static typing assertions.
Patch by Adam Turner
* 14050: LaTeXTranslator fails to build documents using the "acronym"
standard role.
Patch by Günter Milde
* LaTeX: Fix rendering for grid filled merged vertical cell.
Patch by Tim Nordell
* 14228: LaTeX: Fix overrun footer for cases of merged vertical table cells.
Patch by Tim Nordell
* 14207: Fix creating ``HTMLThemeFactory`` objects in third-party extensions.
Patch by Adam Turner
* 3099: LaTeX: PDF build crashes if a code-block contains more than
circa 1350 codelines (about 27 a4-sized pages at default pointsize).
Patch by Jean-François B.
* 14064: LaTeX: TABs ending up in sphinxVerbatim fail to obey tab stops.
Patch by Jean-François B.
* 14089: autodoc: Improve support for non-weakreferencable objects.
Patch by Adam Turner
* LaTeX: Fix accidental removal at ``3.5.0`` (8854) of the documentation of
``literalblockcappos`` key of  :ref:`'sphinxsetup' <latexsphinxsetup>`.
Patch by Jean-François B.

Testing
-------

Links

• PyPI: https://pypi.org/project/sphinx
• Changelog: https://data.safetycli.com/changelogs/sphinx/