Updated service to use new XOS core version: 2.1.22

Change-Id: I27ee51e37d97ff2735a10f5f49c8ddc8a937f282
diff --git a/Dockerfile b/Dockerfile
index cb2110d..0274a3c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 # docker build -t xosproject/xos-tosca:candidate .
 
 # xosproject/xos-tosca
-FROM xosproject/xos-client:2.1.19
+FROM xosproject/xos-client:2.1.22
 
 # Set environment variables
 ENV CODE_SOURCE .