refactor: import timers, process, and Buffer from node: (#7157)

Co-authored-by: muchnameless <12682826+muchnameless@users.noreply.github.com>
Co-authored-by: Almeida <almeidx@pm.me>

src/rest/RequestHandler.js

@@ -1,5 +1,6 @@
 'use strict';
 
+const { setTimeout } = require('node:timers');
 const { setTimeout: sleep } = require('node:timers/promises');
 const { AsyncQueue } = require('@sapphire/async-queue');
 const DiscordAPIError = require('./DiscordAPIError');