Upgrade to use node16

Marc Britton · Marc Britton · commit 0df653452c79 · 2024-07-23T17:31:00.000+10:00
diff --git a/action.yml b/action.yml
@@ -5,5 +5,5 @@ outputs:
   version:
     description: 'Flutter version number and build number'
 runs:
-  using: 'node12'
+  using: 'node20'
   main: 'dist/index.js'
