Bump sphinx from 6.2.0 to 6.2.1 (#551)

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 6.2.0 to 6.2.1.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES)
- [Commits](sphinx-doc/sphinx@v6.2.0...v6.2.1)

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

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

Author: dependabot[bot]

requirements-dev.txt

@@ -3,5 +3,5 @@
 docutils==0.19
 flake8==6.0.0
 mypy==1.2.0
-Sphinx==6.2.0
+Sphinx==6.2.1
 types-pygments==2.15.0.0