Bump sphinx from 5.2.3 to 5.3.0

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 5.2.3 to 5.3.0.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES)
- [Commits](sphinx-doc/sphinx@v5.2.3...v5.3.0)

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

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

requirements.txt

@@ -10,6 +10,6 @@ gunicorn==20.1.0
 pycodestyle==2.9.1
 pydocstyle==6.1.1
 requests==2.28.1
-Sphinx==5.2.3
+Sphinx==5.3.0
 Werkzeug==2.0.3
 setuptools>=65.5.1 # not directly required, pinned by Snyk to avoid a vulnerability