Run using Node 16

Actions using Node 12 has been deprecated since September 22, 2022.
See https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/.

Author: ingara

action.yml

@@ -12,5 +12,5 @@ outputs:
   teller-version:
     description: "The Teller version that was installed."
 runs:
-  using: "node12"
+  using: "node16"
   main: "main.js"