update ls to 0.6.0and clangd to 13.0.0

Author: Alberto Iannaccone

Diff for: arduino-ide-extension/scripts/download-ls.js

@@ -4,8 +4,8 @@
 // - https://downloads.arduino.cc/arduino-language-server/clangd/clangd_${VERSION}_${SUFFIX}
 
 (() => {
-  const DEFAULT_ALS_VERSION = '0.5.0';
-  const DEFAULT_CLANGD_VERSION = 'snapshot_20210124';
+  const DEFAULT_ALS_VERSION = '0.6.0';
+  const DEFAULT_CLANGD_VERSION = '13.0.0';
 
   const path = require('path');
   const shell = require('shelljs');
@@ -20,7 +20,7 @@
     .option('clangd-version', {
       alias: 'cv',
       default: DEFAULT_CLANGD_VERSION,
-      choices: ['snapshot_20210124'],
+      choices: [DEFAULT_CLANGD_VERSION, 'snapshot_20210124'],
       describe: `The version of 'clangd' to download. Defaults to ${DEFAULT_CLANGD_VERSION}.`,
     })
     .option('force-download', {