Use 0.12.0-rc3 CLI.

Signed-off-by: Akos Kitta <kittaakos@typefox.io>

Author: Akos Kitta

arduino-ide-extension/scripts/download-cli.js

@@ -10,7 +10,7 @@
 
 (() => {
 
-    const DEFAULT_VERSION = '0.12.0-rc2'; // require('moment')().format('YYYYMMDD');
+    const DEFAULT_VERSION = '0.12.0-rc3'; // require('moment')().format('YYYYMMDD');
 
     const path = require('path');
     const shell = require('shelljs');