⬆️ Use node 16 for action

* node.js 12 was deprecated

https://docs.github.com/en/actions/creating-actions/metadata-syntax-for-github-actions#runs-for-javascript-actions

Author: say8425

action.yml

@@ -20,7 +20,7 @@ inputs:
     description: 'Set output file where variables are write'
     required: false
 runs:
-  using: 'node12'
+  using: 'node16'
   main: 'dist/index.js'
 branding:
   icon: 'lock'