chore: changed target of old-backend service in docker-compose file

docker-compose.yml

@@ -107,7 +107,7 @@ services:
     build:
       dockerfile: packages/hoppscotch-backend/Dockerfile
       context: .
-      target: dev
+      target: prod
     env_file:
       - ./.env
     restart: always
@@ -117,7 +117,7 @@ services:
       - PORT=3000
     volumes:
       # Uncomment the line below when modifying code. Only applicable when using the "dev" target.
-      - ./packages/hoppscotch-backend/:/usr/src/app
+      # - ./packages/hoppscotch-backend/:/usr/src/app
       - /usr/src/app/node_modules/
     depends_on:
       hoppscotch-db: