ESLint: allow for..of

ts/test-both/challenge_test.ts

@@ -1,6 +1,6 @@
 // Copyright 2021 Signal Messenger, LLC
 // SPDX-License-Identifier: AGPL-3.0-only
-/* eslint-disable no-await-in-loop, no-restricted-syntax */
+/* eslint-disable no-await-in-loop */
 /* eslint-disable @typescript-eslint/no-explicit-any */
 
 import { assert } from 'chai';