Upd umbrella helm chart with omec-control-plane

omec-control plane is updated to take new SPGW image to fix gauge
counter delete

Change-Id: I85748e71a80ccf81684e1a2be237b7247e891357
diff --git a/sdcore-helm-charts/Chart.yaml b/sdcore-helm-charts/Chart.yaml
index bfaaff1..123a9c9 100644
--- a/sdcore-helm-charts/Chart.yaml
+++ b/sdcore-helm-charts/Chart.yaml
@@ -8,7 +8,7 @@
 description: SD-Core control plane services
 icon: https://guide.opencord.org/logos/cord.svg
 type: application
-version: 0.9.19
+version: 0.9.20
 home: https://opennetworking.org/sd-core/
 maintainers:
   - name: SD-Core Support
@@ -16,7 +16,7 @@
 
 dependencies:
   - name: omec-control-plane
-    version: 0.9.17
+    version: 0.9.18
     repository: https://charts.aetherproject.org
     condition: omec-control-plane.enable4G