Use node prefix for build-in modules (#3340)

It is basically a cosmetic thing, but has the following advantages:

1. Consistency with the official node documentation. The prefix is used
there.
2. It is easier to recognize the build-in modules.

tests/unit/classes/class_spec.js

@@ -1,4 +1,4 @@
-const path = require("path");
+const path = require("node:path");
 const { JSDOM } = require("jsdom");
 
 describe("File js/class", () => {