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/ldapserver.js

@@ -8,7 +8,7 @@ exports = module.exports = {
 };
 
 const addonConfigs = require('./addonconfigs.js'),
-    assert = require('assert'),
+    assert = require('node:assert'),
     apps = require('./apps.js'),
     AuditSource = require('./auditsource.js'),
     BoxError = require('./boxerror.js'),
@@ -20,7 +20,7 @@ const addonConfigs = require('./addonconfigs.js'),
     mail = require('./mail.js'),
     safe = require('safetydance'),
     users = require('./users.js'),
-    util = require('util');
+    util = require('node:util');
 
 let gServer = null;