message: Allow more complicated type in `BincodeFormat`
diff: @@ -18,6 +18,7 @@ use tokio_serde::{Deserializer, Serializer};
  use super::Message;
  /// bincode encoder/decoder for messages.
  +#[allow(clippy::type_complexity)]
  pub struct BincodeFormat(
  // Note: This scary looking type is because `bincode` encodes its options at the type level.
  // The exact shape is determined by `BincodeFormat::default()`.
  