Bump sphinx from 5.2.1 to 5.2.3 in /docs (#3305)

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 5.2.1 to 5.2.3.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/5.x/CHANGES)
- [Commits](https://github.com/sphinx-doc/sphinx/compare/v5.2.1...v5.2.3

)

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

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