Updating to Node16 from Node12

I believe this is what caught us off guard, so I'm updating to node16 to hopefully address the issue with this action and get us back up and running.

action.yml

@@ -28,5 +28,5 @@ inputs:
     required: true
     default: ${{github.token}}
 runs:
-  using: "node12"
+  using: "node16"
   main: "index.js"