Update ROC to 1.4.52 for release-1.6

Change-Id: I95b94c48f63ce696cae74e209d993a5fc4d7ce4e
diff --git a/configs/release-1.6 b/configs/release-1.6
index 511b8b8..c468976 100644
--- a/configs/release-1.6
+++ b/configs/release-1.6
@@ -9,7 +9,7 @@
 5G_RAN_SIM_CHART         := aether/5g-ran-sim --version 0.3.0
 
 # For installing the ROC
-AETHER_ROC_UMBRELLA_CHART := aether/aether-roc-umbrella --version 1.4.50
+AETHER_ROC_UMBRELLA_CHART := aether/aether-roc-umbrella --version 1.4.52
 ATOMIX_CONTROLLER_CHART   := atomix/atomix-controller --version 0.6.8
 ATOMIX_RAFT_STORAGE_CHART := atomix/atomix-raft-storage --version 0.1.15
 ONOS_OPERATOR_CHART       := onosproject/onos-operator --version 0.4.14