Update gitlab/gitlab-ce Docker tag to v18

This MR contains the following updates:

Package	Update	Change
gitlab/gitlab-ce (changelog)	major	17.8.7-ce.0 -> 18.2.1-ce.0

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webserver/docker_gitlab/templates/docker-compose.yml

@@ -3,7 +3,7 @@ services:
   app:
 
     # Version pinned due to upgrade problems with 17.9.x  
-    image: gitlab/gitlab-ce:17.8.7-ce.0
+    image: gitlab/gitlab-ce:18.2.1-ce.0
     restart: always
     ports:
       - "444:22"