fix(cluster): set flux gitrepo default interval to 5m0s

tmpl/cluster/gotk-sync.yaml

@@ -5,7 +5,7 @@ metadata:
   name: flux-system
   namespace: flux-system
 spec:
-  interval: 1m0s
+  interval: 5m0s
   ref:
     branch: main
   url: ${BOOTSTRAP_GIT_REPOSITORY}