SEBA-457 Upgrade to xos-core 2.2.5

Change-Id: I7c35d8899b59463d0e19a55cc622809a6dcc7d33
diff --git a/Dockerfile.synchronizer b/Dockerfile.synchronizer
index 14a1465..ee84885 100644
--- a/Dockerfile.synchronizer
+++ b/Dockerfile.synchronizer
@@ -15,7 +15,7 @@
 # docker build -t xosproject/fabric-synchronizer:candidate -f Dockerfile.synchronizer .
 
 # xosproject/fabric-synchronizer
-FROM xosproject/xos-synchronizer-base:2.2.1
+FROM xosproject/xos-synchronizer-base:2.2.5
 
 COPY xos/synchronizer /opt/xos/synchronizers/fabric
 COPY VERSION /opt/xos/synchronizers/fabric/