Bump sphinx-click from 3.1.0 to 4.0.0 in /docs

Bumps [sphinx-click](https://github.com/click-contrib/sphinx-click) from 3.1.0 to 4.0.0.
- [Release notes](https://github.com/click-contrib/sphinx-click/releases)
- [Commits](click-contrib/sphinx-click@3.1.0...4.0.0)

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

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

Author: dependabot[bot]

docs/requirements.txt

@@ -1,3 +1,3 @@
 furo==2022.3.4
 sphinx==4.5.0
-sphinx-click==3.1.0
+sphinx-click==4.0.0