Bump sphinx from 4.5.0 to 5.0.0 in /docs

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 4.5.0 to 5.0.0.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/5.x/CHANGES)
- [Commits](sphinx-doc/sphinx@v4.5.0...v5.0.0)

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

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

Author: dependabot[bot]

docs/requirements.txt

@@ -1,3 +1,3 @@
 furo==2022.4.7
-sphinx==4.5.0
+sphinx==5.0.0
 sphinx-click==4.0.3