Bump sphinx-click from 4.3.0 to 5.1.0 in /docs

Bumps [sphinx-click](https://github.com/click-contrib/sphinx-click) from 4.3.0 to 5.1.0.
- [Release notes](https://github.com/click-contrib/sphinx-click/releases)
- [Commits](click-contrib/sphinx-click@4.3.0...5.1.0)

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

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

docs/requirements.txt

@@ -1,3 +1,3 @@
 sphinx==7.2.6
-sphinx-click==4.3.0
+sphinx-click==5.1.0
 sphinx-rtd-theme==1.0.0