chore: replace soon-to-be deprecated node12 with node16

Author: KieranKaelin

action.yml

@@ -25,7 +25,7 @@ inputs:
     required: true
     default: "true"
 runs:
-  using: "node12"
+  using: "node16"
   main: "dist/index.js"
 branding:
   icon: "check-square"