Bump sphinx from 5.2.0.post0 to 5.2.1 in /docs (#76)

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 5.2.0.post0 to 5.2.1.
- [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/commits/v5.2.1)

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

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

docs/requirements.txt

@@ -1,4 +1,4 @@
 furo==2022.9.15
-sphinx==5.2.0.post0
+sphinx==5.2.1
 sphinx-click==4.3.0
 myst_parser==0.18.0