use node: prefix for requires

mostly because code is being autogenerated by all the AI stuff using
this prefix. it's also used in the stack trace.

src/asynctask.js

@@ -1,7 +1,7 @@
 'use strict';
 
 const debug = require('debug')('box:asynctask'),
-    EventEmitter = require('events'),
+    EventEmitter = require('node:events'),
     safe = require('safetydance');
 
 // this runs in-process