Bump click from 8.1.3 to 8.1.6 in /docs

Bumps [click](https://github.com/pallets/click) from 8.1.3 to 8.1.6.
- [Release notes](https://github.com/pallets/click/releases)
- [Changelog](https://github.com/pallets/click/blob/8.1.6/CHANGES.rst)
- [Commits](pallets/click@8.1.3...8.1.6)

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

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

docs/requirements.txt

@@ -1,6 +1,6 @@
 sphinx==6.2.1
 sphinx-click==4.4.0
 sphinx-rtd-theme==1.2.2
-click==8.1.3
+click==8.1.6
 tabulate==0.9.0
 dateparser==1.1.8