refactor: refactoring imports

将来ESMに移行しやすいように
Related: #7658

なんかmochaが起動しなくなってるけど理由不明
すぐ直したい

src/remote/activitypub/renderer/update.ts

@@ -1,5 +1,5 @@
-import config from '@/config';
-import { User } from '@/models/entities/user';
+import config from '@/config/index.js';
+import { User } from '@/models/entities/user.js';
 
 export default (object: any, user: { id: User['id'] }) => {
 	const activity = {