Update docker-compose.yml

Signed-off-by: Loïc Houpert <10154151+lhoupert@users.noreply.github.com>

.examples/docker-compose/insecure/mariadb/apache/docker-compose.yml

@@ -2,8 +2,8 @@ version: '3'
 
 services:
   db:
-    image: mariadb:10.6
-    command: --transaction-isolation=READ-COMMITTED --log-bin=binlog --binlog-format=ROW
+    image: mariadb:11.3.2
+    command: --transaction-isolation=READ-COMMITTED --log-bin=binlog --binlog-format=ROW --character-set-server=utf8
     restart: always
     volumes:
       - db:/var/lib/mysql:Z