Bump sphinx from 8.2.3 to 9.0.1

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 8.2.3 to 9.0.1.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v8.2.3...v9.0.1)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-version: 9.0.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

requirements/readthedocs.txt

@@ -1,6 +1,6 @@
 -r base.txt
 
-Sphinx==8.2.3
+Sphinx==9.0.1
 sphinx-removed-in
 docutils