fix: use node 16

The action.yml was using node 12 still, even though the rest of the toolchain had earlier been updated to node 16

Author: jim80net

action.yml

@@ -31,5 +31,5 @@ outputs:
   response:
     description: 'The final response of the AWS API.'
 runs:
-  using: 'node12'
+  using: 'node16'
   main: 'dist/index.js'