message: fix: Make sure feature order is actually never serialized
diff: @@ -198,7 +198,10 @@ pub struct MessageAttributes {
  )]
  pub actuator_type: Option<Vec<String>>,
  // Never serialize this, its for internal use only
  - #[cfg_attr(feature = "serialize_json", serde(rename = "FeatureOrder"))]
  + #[cfg_attr(
  + feature = "serialize_json",
  + serde(rename = "FeatureOrder"),
  + serde(skip_serializing))]
  pub feature_order: Option<Vec<u32>>,
  }
  