Update mariadb Docker tag to v13

stacks/dashboard/compose.yaml

@@ -37,7 +37,7 @@ services:
       - path: ${WEBHOSTING_ENV_DIR:-/etc/webhosting}/dashboard/db.env
         required: true
         format: raw
-    image: mariadb:12
+    image: mariadb:13
     container_name: it-strategy-dashboard-db
     restart: always
     environment: