Updated service to use new XOS core version: 2.1.25

Change-Id: I27a1a970de53044347304e3343797f2b25f89a4d
diff --git a/Dockerfile.synchronizer b/Dockerfile.synchronizer
index 231ba94..8e07bf8 100644
--- a/Dockerfile.synchronizer
+++ b/Dockerfile.synchronizer
@@ -14,7 +14,7 @@
 
 # xosproject/simpleexampleservice-synchronizer
 
-FROM xosproject/xos-synchronizer-base:2.1.22
+FROM xosproject/xos-synchronizer-base:2.1.25
 
 COPY xos/synchronizer /opt/xos/synchronizers/simpleexampleservice
 COPY VERSION /opt/xos/synchronizers/simpleexampleservice/