Bumpup fabric8 kubernetes clients to 5.6.0

Change-Id: I4b6665da030834125ed80b3f0ea2715603eedf71
diff --git a/apps/k8s-node/app/BUILD b/apps/k8s-node/app/BUILD
index 2852712..6b09f7a 100644
--- a/apps/k8s-node/app/BUILD
+++ b/apps/k8s-node/app/BUILD
@@ -15,6 +15,7 @@
     "@k8s_model_certificates//jar",
     "@k8s_model_coordination//jar",
     "@k8s_model_discovery//jar",
+    "@k8s_model_flowcontrol//jar",
     "@k8s_model_metrics//jar",
     "@k8s_model_scheduling//jar",
     "@k8s_model_storageclass//jar",