automation: Update docker-gitlab Docker tag to v16.6.1

This MR contains the following updates:

Package	Update	Change
docker-gitlab	minor	16.5.1-ce.0 -> 16.6.1-ce.0

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roles/docker_gitlab/defaults/main.yml

@@ -43,6 +43,6 @@ docker_gitlab_oidc_issuer: https://auth.example.com/realms/example
 docker_gitlab_oidc_secret: secret
 
 # renovate: depName=docker.io/gitlab/gitlab-ce
-docker_gitlab_version: 16.5.1-ce.0
+docker_gitlab_version: 16.6.1-ce.0
 
 docker_gitlab_image_version: "{{ docker_gitlab_version }}"