Bump sphinx from 5.3.0 to 6.1.3

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 5.3.0 to 6.1.3.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES)
- [Commits](sphinx-doc/sphinx@v5.3.0...v6.1.3)

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

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

setup.cfg

@@ -65,7 +65,7 @@ dev =
     vermin
 
 doc =
-    Sphinx==5.3.0
+    Sphinx==6.1.3
     docutils==0.19
     myst-parser