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/storage/interface.js

@@ -35,7 +35,7 @@ exports = module.exports = {
     injectPrivateFields
 };
 
-const assert = require('assert'),
+const assert = require('node:assert'),
     BoxError = require('../boxerror.js');
 
 function removePrivateFields(apiConfig) {