update incubator chart url in aether helm charts

Change-Id: Id289b1bbe12ca4c1a190cd19f7fc16db4f29eceb
diff --git a/omec/omec-control-plane/requirements.yaml b/omec/omec-control-plane/requirements.yaml
index 8633a1f..49146fd 100644
--- a/omec/omec-control-plane/requirements.yaml
+++ b/omec/omec-control-plane/requirements.yaml
@@ -5,5 +5,5 @@
 dependencies:
   - name: cassandra
     version: 0.13.1
-    repository: https://kubernetes-charts-incubator.storage.googleapis.com/
+    repository: https://charts.helm.sh/incubator
     condition: cassandra.deploy