message: refactor(status): add allow(deprecated) to StatusClass enum for older rust versions
diff: @@ -591,6 +591,7 @@ impl From<StatusCode> for u16 {
  /// to get the appropriate *category* of status.
  #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Copy)]
  #[deprecated(note = "StatusClass is going away. Use the StatusCode::is_<class>() methods instead.")]
  +#[allow(deprecated)]
  pub enum StatusClass {
  /// 1xx (Informational): The request was received, continuing process
  Informational,
  