message: Fix &str lint
diff: @@ -41,7 +41,7 @@ pub trait SetupIntentExt {
  where
  Self: Sized;
  - fn retrieve_ext(client: &Client, setup_intent_secret: &String) -> Response<Self>
  + fn retrieve_ext(client: &Client, setup_intent_secret: &str) -> Response<Self>
  where
  Self: Sized;
  }
  @@ -63,7 +63,7 @@ impl SetupIntentExt for SetupIntent {
  unimplemented!()
  }
  - fn retrieve_ext(_client: &Client, _setup_intent_secret: &String) -> Response<SetupIntent> {
  + fn retrieve_ext(_client: &Client, _setup_intent_secret: &str) -> Response<SetupIntent> {
  unimplemented!()
  //client.get(&format!("/setup_intents/{}", setup_intent_secret))
  }
  