Bump sphinx from 7.1.2 to 7.2.3

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 7.1.2 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@v7.1.2...v7.2.3)

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

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -10,6 +10,6 @@ gunicorn==21.2.0
 pycodestyle==2.11.0
 pydocstyle==6.3.0
 requests==2.31.0
-Sphinx==7.1.2
+Sphinx==7.2.3
 Werkzeug==2.3.7
 setuptools>=65.5.1 # not directly required, pinned by Snyk to avoid a vulnerability