Bump sphinx from 7.2.2 to 7.2.3 in /docs

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 7.2.2 to 7.2.3.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES)
- [Commits](sphinx-doc/sphinx@v7.2.2...v7.2.3)

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

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

docs/requirements.txt

@@ -1,3 +1,3 @@
 furo==2023.8.19
-sphinx==7.2.2
+sphinx==7.2.3
 myst_parser==2.0.0