Adopt Compose v2

Signed-off-by: Nicolas De Loof <nicolas.deloof@gmail.com>

nginx-flask-mysql/backend/hello.py

@@ -9,7 +9,7 @@ class DBManager:
         self.connection = mysql.connector.connect(
             user=user, 
             password=pf.read(),
-            host=host, # name of the mysql service as set in the docker-compose file
+            host=host, # name of the mysql service as set in the docker compose file
             database=database,
             auth_plugin='mysql_native_password'
         )