gitlab: Sync chart version with cluster (9.11.8).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Change-Id: If3b39b251b856d348c91e2f7f6e15423bbe3d625
diff --git a/gitlab-system/gitlab.yaml b/gitlab-system/gitlab.yaml
index 928a84d..3cc3bb2 100644
--- a/gitlab-system/gitlab.yaml
+++ b/gitlab-system/gitlab.yaml
@@ -5,7 +5,7 @@
   namespace: gitlab-system
 spec:
   chart:
-    version: "7.9.1"
+    version: "9.11.8"
     values:
       global:
         appConfig: