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/hash-stream.js

@@ -1,7 +1,7 @@
 'use strict';
 
-const crypto = require('crypto'),
-    stream = require('stream'),
+const crypto = require('node:crypto'),
+    stream = require('node:stream'),
     TransformStream = stream.Transform;
 
 class HashStream extends TransformStream {