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.

modules/default/newsfeed/newsfeedfetcher.js

@@ -5,7 +5,7 @@
  * MIT Licensed.
  */
 
-const stream = require("stream");
+const stream = require("node:stream");
 const FeedMe = require("feedme");
 const iconv = require("iconv-lite");
 const { htmlToText } = require("html-to-text");