Update GitLab and GitLab Runner.

Change-Id: Ie1955a5964edcb500c4f3681c96dafa996782a68
diff --git a/gitlab-system/gitlab.yaml b/gitlab-system/gitlab.yaml
index ec8eced..213ab83 100644
--- a/gitlab-system/gitlab.yaml
+++ b/gitlab-system/gitlab.yaml
@@ -5,7 +5,7 @@
   namespace: gitlab-system
 spec:
   chart:
-    version: "6.7.1"
+    version: "6.7.5"
     values:
       global:
         appConfig: