Bump sphinx from 6.1.3 to 6.2.1

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 6.1.3 to 6.2.1.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES)
- [Commits](https://github.com/sphinx-doc/sphinx/compare/v6.1.3...v6.2.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

setup.py

@@ -67,7 +67,7 @@ setup(
     setup_requires=["pytest-runner"],
     extras_require={
         "docs": [
-            "Sphinx==6.1.3",
+            "Sphinx==6.2.1",
             "furo==2023.3.27",
             "sphinx-autobuild",
             "codespell",