Update dependency sphinx to v7.2.6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sphinx (changelog)	==7.2.5 -> ==7.2.6

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Release Notes

sphinx-doc/sphinx (sphinx)

### [`v7.2.6`](https://togithub.com/sphinx-doc/sphinx/blob/HEAD/CHANGES#Release-726-released-Sep-13-2023) [Compare Source](https://togithub.com/sphinx-doc/sphinx/compare/v7.2.5...v7.2.6) \===================================== ## Bugs fixed - [#​11679](https://togithub.com/sphinx-doc/sphinx/issues/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](https://togithub.com/sphinx-doc/sphinx/issues/11679): Use :py:func:`importlib.reload` to reload modules in autodoc. Patch by Matt Wozniski and Adam Turner.

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