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/routes/mailserver.js

@@ -9,11 +9,11 @@ exports = module.exports = {
     getLocation
 };
 
-const assert = require('assert'),
+const assert = require('node:assert'),
     AuditSource = require('../auditsource.js'),
     BoxError = require('../boxerror.js'),
     debug = require('debug')('box:routes/mailserver'),
-    http = require('http'),
+    http = require('node:http'),
     HttpError = require('@cloudron/connect-lastmile').HttpError,
     HttpSuccess = require('@cloudron/connect-lastmile').HttpSuccess,
     mailServer = require('../mailserver.js'),