Update GitLab.

docker-compose.yml

 ---
 services:
   gitlab:
-    image: registry.hub.docker.com/gitlab/gitlab-ce:17.11.2-ce.0
+    image: registry.hub.docker.com/gitlab/gitlab-ce:18.0.0-ce.0
     restart: always
     environment:
       # yamllint disable rule:line-length