Bump sphinx from 5.0.2 to 5.1.0

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 5.0.2 to 5.1.0.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/5.x/CHANGES)
- [Commits](sphinx-doc/sphinx@v5.0.2...v5.1.0)

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

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

Author: dependabot[bot]

docs/requirements.txt

@@ -1,4 +1,4 @@
 alabaster==0.7.12
-Sphinx==5.0.2
+Sphinx==5.1.0
 sphinx-rtd-theme==1.0.0
 sphinx-copybutton==0.5.0