gitlab: Update Helm chart to 7.0.3.

Change-Id: If365310cc1b49b6ecbd74b7388292b3a6ed393c3
diff --git a/gitlab-system/gitlab.yaml b/gitlab-system/gitlab.yaml
index 7be4b23..1cefe76 100644
--- a/gitlab-system/gitlab.yaml
+++ b/gitlab-system/gitlab.yaml
@@ -5,7 +5,7 @@
   namespace: gitlab-system
 spec:
   chart:
-    version: "6.11.7"
+    version: "7.0.3"
     values:
       global:
         appConfig: