Bump versions for testing.

Author: geerlingguy

molecule/default/version.yml

@@ -19,7 +19,7 @@
 
     - name: Set the test GitLab version number for Debian.
       set_fact:
-        gitlab_version: '11.4.0-ce.0'
+        gitlab_version: '15.6.3-ce.0'
       when: ansible_os_family == 'Debian'
 
     - name: Set the test GitLab version number for RedHat.