feat(action): disable cache by default

Author: socheatsok78

action.yml

@@ -15,7 +15,7 @@ inputs:
   cache:
     description: 'Cache the installed Flutter SDK. Default: True'
     required: false
-    default: "true"
+    default: "false"
   cache-key:
     description: "An explicit key for restoring and saving the Flutter SDK to/from cache"
     required: false