Updated service to use new XOS core version: 2.1.22

Change-Id: I0f935d502a7cbdad5309fef42c9a08d954bac7a9
diff --git a/Dockerfile.synchronizer b/Dockerfile.synchronizer
index d5f4457..dc0b550 100644
--- a/Dockerfile.synchronizer
+++ b/Dockerfile.synchronizer
@@ -14,7 +14,7 @@
 
 # xosproject/openstack-synchronizer
 
-FROM xosproject/xos-synchronizer-base:2.1.21
+FROM xosproject/xos-synchronizer-base:2.1.22
 
 COPY xos/synchronizer /opt/xos/synchronizers/openstack
 COPY VERSION /opt/xos/synchronizers/openstack/