gitlab: Update chart to 7.7.2.

Change-Id: I812dd5bb6b6b51b22fad6377c38409ec7e50ce37
diff --git a/gitlab-system/gitlab.yaml b/gitlab-system/gitlab.yaml
index 7116f5d..6e83105 100644
--- a/gitlab-system/gitlab.yaml
+++ b/gitlab-system/gitlab.yaml
@@ -5,7 +5,7 @@
   namespace: gitlab-system
 spec:
   chart:
-    version: "7.6.0"
+    version: "7.7.2"
     values:
       global:
         appConfig: