Bump sphinx from 8.0.2 to 9.0.4

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 8.0.2 to 9.0.4.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/v9.0.4/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v8.0.2...v9.0.4)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-version: 9.0.4
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -22,7 +22,7 @@ rstcheck==6.2.5
 rstcheck-core==1.2.2
 six==1.17.0
 snowballstemmer==3.0.1
-Sphinx==8.0.2
+Sphinx==9.0.4
 sphinx-rtd-theme==3.0.2
 sphinxcontrib-applehelp==2.0.0
 sphinxcontrib-devhelp==2.0.0