Update deprecated Node 16 to 20

TWiStErRob · eregon · commit 54a18e26dbbb · 2023-10-26T15:25:49.000+02:00
diff --git a/action.yml b/action.yml
@@ -39,5 +39,5 @@ outputs:
   ruby-prefix:
     description: 'The prefix of the installed ruby'
 runs:
-  using: 'node16'
+  using: 'node20'
   main: 'dist/index.js'
