Update to Node 16 (#50)

* Update action node version

* Use lockfile v2

Author: yhkaplan

action.yml

@@ -7,8 +7,8 @@ inputs:
     required: false
     default: latest
 runs:
-  using: 'node12'
+  using: 'node16'
   main: 'dist/index.js'
 branding:
   icon: 'code'
-  color: 'blue'
+  color: 'blue'