Fix deprecated default program import with named import (ampproject#3…

…9932)

Per migration docs of Commander v12, use the named import instead of the deprecated default import.

https://github.com/tj/commander.js/tree/v12.0.0

https://github.com/tj/commander.js/blob/v12.0.0/docs/deprecated.md#default-import-of-global-command-object

validator/js/nodejs/index.js

@@ -5,7 +5,7 @@ const fs = require('fs');
 const http = require('http');
 const https = require('https');
 const path = require('path');
-const program = require('commander');
+const { program } = require('commander');
 const Promise = require('promise');
 const util = require('util');
 const vm = require('vm');