CI(deps): Update dependency sphinx to v9.0.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
sphinx (changelog)	==9.0.1 -> ==9.0.4

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Release Notes

sphinx-doc/sphinx (sphinx)

v9.0.4: Sphinx 9.0.4

Compare Source

Changelog: https://www.sphinx-doc.org/en/master/changes/9.0.html

Bugs fixed

• #​14143: Fix spurious build warnings when translators reorder references
  in strings, or use translated display text in references.
  Patch by Matt Wang.

v9.0.3: Sphinx 9.0.3

Compare Source

Changelog: https://www.sphinx-doc.org/en/master/changes/9.0.html

Bugs fixed

• #​14142: autodoc: Restore some missing exports in sphinx.ext.autodoc.
  Patch by Adam Turner.

v9.0.2: Sphinx 9.0.2

Compare Source

Changelog: https://www.sphinx-doc.org/en/master/changes/9.0.html

Bugs fixed

• #​14142: autodoc: Restore sphinx.ext.autodoc.mock.
  Patch by Adam Turner.

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