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.

js/check_config.js

@@ -5,8 +5,8 @@
  * By Rodrigo Ramírez Norambuena https://rodrigoramirez.com
  * MIT Licensed.
  */
-const path = require("path");
-const fs = require("fs");
+const path = require("node:path");
+const fs = require("node:fs");
 const { Linter } = require("eslint");
 
 const linter = new Linter();