Upgrade Node to 16 (#37)

* Upgrade Node Version

Node.js 12 actions are deprecated, should we upgrade to 16?

* bump version

* Update package.json

Co-authored-by: Julian Gruber <julian@juliangruber.com>

Co-authored-by: Julian Gruber <julian@juliangruber.com>

Author: steve-keep

action.yml

@@ -15,5 +15,5 @@ inputs:
     description: 'Pull Request repo in owner/repo format'
     required: false
 runs:
-  using: 'node12'
+  using: 'node16'
   main: 'dist/index.js'