refactor: make debug handler async

src/routes/debug.js

@@ -9,7 +9,7 @@ const path = require('path');
 module.exports = function (app) {
 	const router = express.Router();
 
-	router.get('/test', (req, res) => {
+	router.get('/test', async (req, res) => {
 		res.redirect(404);
 	});