Updated service to use new XOS core version: 2.1.25

Change-Id: Ied629a8427ea29ca83262a4a723790cdc8f94cf9
diff --git a/Dockerfile.synchronizer b/Dockerfile.synchronizer
index d2ec0e6..57fca57 100644
--- a/Dockerfile.synchronizer
+++ b/Dockerfile.synchronizer
@@ -14,7 +14,7 @@
 
 # xosproject/exampleservice-synchronizer
 
-FROM xosproject/xos-synchronizer-base:2.1.22
+FROM xosproject/xos-synchronizer-base:2.1.25
 
 COPY xos/synchronizer /opt/xos/synchronizers/exampleservice
 COPY VERSION /opt/xos/synchronizers/exampleservice/