Merge pull request 'Update mysql Docker tag to v9' (#12) from renovate/mysql-9.x into main

Reviewed-on: #12

docker-compose.yml

@@ -29,7 +29,7 @@ services:
       GRAPHQL_ENDPOINT_PUBLIC: http://localhost:3000/graphql
       GRAPHQL_ENDPOINT_INTERNAL: http://backend:3000/graphql
   database:
-    image: mysql:8
+    image: mysql:9
     restart: always
     environment:
       MYSQL_ROOT_PASSWORD: root