gitlab: Update Helm chart to 6.11.7.

Change-Id: I6b8465b56342615e65f74db07dba38f3052ce457
diff --git a/gitlab-system/gitlab.yaml b/gitlab-system/gitlab.yaml
index 82e4012..7be4b23 100644
--- a/gitlab-system/gitlab.yaml
+++ b/gitlab-system/gitlab.yaml
@@ -5,7 +5,7 @@
   namespace: gitlab-system
 spec:
   chart:
-    version: "6.11.2"
+    version: "6.11.7"
     values:
       global:
         appConfig: