Releasing docker image with new olt app

Change-Id: I5b047eb6dc70df7097b264956f7e30e0b60aabab
diff --git a/Dockerfile.voltha-onos b/Dockerfile.voltha-onos
index c96a728..73c6c08 100644
--- a/Dockerfile.voltha-onos
+++ b/Dockerfile.voltha-onos
@@ -14,7 +14,7 @@
 
 
 # Download and copy the specified onos apps
-FROM maven:3.6.1-jdk-8-alpine as download
+FROM maven:3.6.3-openjdk-11-slim as download
 
 # The ENV settings must be replicated below as they are not shared between stages
 ENV DOWNLOAD_ROOT=/download