dist: require node20

Node16 has reached end-of-life and is no longer supported.

See: https://github.com/nodejs/release#release-schedule
See: https://nodejs.org/en/blog/announcements/nodejs16-eol

action.yml

@@ -63,7 +63,7 @@ outputs:
       Whether or not the changes could be backported successfully to all targets - broken down by target.
       Follows the pattern '{{label}}=true|false'.
 runs:
-  using: "node16"
+  using: "node20"
   main: "dist/index.js"
 branding:
   icon: 'copy'