MAPG-159 update MariaDB to 10.3 in docker-compose.yml

docker-compose.yml

@@ -10,7 +10,7 @@ services:
             - 'mariadb'
             - 'mail'
     mariadb:
-        image: mariadb:10.1
+        image: mariadb:10.3
         volumes:
             - mysql:/var/lib/mysql
         environment: