Freeze onos-operator chart

Change-Id: I6d8e46f1720bf44446680c2c6a2cefc9ef0fecfd
diff --git a/configs/release-1.6 b/configs/release-1.6
index 7c0bec4..763eb14 100644
--- a/configs/release-1.6
+++ b/configs/release-1.6
@@ -2,7 +2,7 @@
 #
 # SPDX-License-Identifier: LicenseRef-ONF-Member-Only-1.0
 
-OMEC_CONTROL_PLANE_CHART := aether/omec-control-plane --version 0.9.17
+OMEC_CONTROL_PLANE_CHART := aether/omec-control-plane --version 0.9.18
 OMEC_USER_PLANE_CHART    := aether/omec-user-plane --version 0.5.4
 OMEC_SUB_PROVISION_CHART := aether/omec-sub-provision --version 0.3.2
 5GC_CONTROL_PLANE_CHART  := aether/5g-control-plane --version 0.5.6