Bump mkdocs from 1.6.0 to 1.6.1 in /tests in the dependencies group

Bumps the dependencies group in /tests with 1 update: [mkdocs](https://github.com/mkdocs/mkdocs).


Updates `mkdocs` from 1.6.0 to 1.6.1
- [Release notes](https://github.com/mkdocs/mkdocs/releases)
- [Commits](mkdocs/mkdocs@1.6.0...1.6.1)

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

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

tests/requirements.txt

@@ -76,7 +76,7 @@ mergedeep==1.3.4
     # via
     #   mkdocs
     #   mkdocs-get-deps
-mkdocs==1.6.0
+mkdocs==1.6.1
     # via
     #   -r requirements.in
     #   mkdocs-ansible