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/network/noop.js

@@ -7,7 +7,7 @@ exports = module.exports = {
     testIPv6Config
 };
 
-const assert = require('assert');
+const assert = require('node:assert');
 
 async function getIPv4(config) {
     assert.strictEqual(typeof config, 'object');