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/externalldap.js

@@ -16,7 +16,7 @@ exports = module.exports = {
     sync
 };
 
-const assert = require('assert'),
+const assert = require('node:assert'),
     AuditSource = require('./auditsource.js'),
     BoxError = require('./boxerror.js'),
     constants = require('./constants.js'),
@@ -29,7 +29,7 @@ const assert = require('assert'),
     settings = require('./settings.js'),
     tasks = require('./tasks.js'),
     users = require('./users.js'),
-    util = require('util');
+    util = require('node:util');
 
 function injectPrivateFields(newConfig, currentConfig) {
     if (newConfig.bindPassword === constants.SECRET_PLACEHOLDER) newConfig.bindPassword = currentConfig.bindPassword;