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/users.js

@@ -77,9 +77,9 @@ const USERS_FIELDS = [ 'id', 'username', 'email', 'fallbackEmail', 'password', '
 const DEFAULT_GHOST_LIFETIME = 6 * 60 * 60 * 1000; // 6 hours
 
 const appPasswords = require('./apppasswords.js'),
-    assert = require('assert'),
+    assert = require('node:assert'),
     BoxError = require('./boxerror.js'),
-    crypto = require('crypto'),
+    crypto = require('node:crypto'),
     constants = require('./constants.js'),
     dashboard = require('./dashboard.js'),
     database = require('./database.js'),
@@ -101,7 +101,7 @@ const appPasswords = require('./apppasswords.js'),
     uaParser = require('ua-parser-js'),
     userDirectory = require('./user-directory.js'),
     superagent = require('@cloudron/superagent'),
-    util = require('util'),
+    util = require('node:util'),
     validator = require('./validator.js'),
     _ = require('./underscore.js');