Updated service to use new XOS core version: 2.1.22

Change-Id: I538e9d29116b24a19c2d742b6257a092f616a59a
diff --git a/Dockerfile.synchronizer b/Dockerfile.synchronizer
index 1ff126f..5c65d49 100644
--- a/Dockerfile.synchronizer
+++ b/Dockerfile.synchronizer
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 # xosproject/vmme-synchronizer
-FROM xosproject/xos-synchronizer-base:2.1.9
+FROM xosproject/xos-synchronizer-base:2.1.22
 
 COPY xos/synchronizer /opt/xos/synchronizers/vmme
 COPY VERSION /opt/xos/synchronizers/vmme/