[Compose] Update SOGo image (v4.0.6.20190222-1)

docker-compose.yml

@@ -139,7 +139,7 @@ services:
             - phpfpm
 
     sogo-mailcow:
-      image: mailcow/sogo:1.51
+      image: mailcow/sogo:1.52
       build: ./data/Dockerfiles/sogo
       environment:
         - DBNAME=${DBNAME}