Updated service to use new XOS core version: 2.1.22

Change-Id: Ic8ea567e2ed22cf94dc9a61d3809bc81a38708db
diff --git a/Dockerfile.synchronizer b/Dockerfile.synchronizer
index eb597c9..519f4df 100644
--- a/Dockerfile.synchronizer
+++ b/Dockerfile.synchronizer
@@ -16,7 +16,7 @@
 
 # xosproject/att-workflow-driver-synchronizer
 
-FROM xosproject/xos-synchronizer-base:2.1.21
+FROM xosproject/xos-synchronizer-base:2.1.22
 
 COPY xos/synchronizer /opt/xos/synchronizers/att-workflow-driver
 COPY VERSION /opt/xos/synchronizers/att-workflow-driver/