message: network-core: sendable P2pService::NodeId
  The tower-hyper port needs this, too.
diff: @@ -43,7 +43,7 @@ pub trait Node {
  /// distinguish subscription streams.
  pub trait P2pService {
  /// Network node identifier.
  - type NodeId: NodeId;
  + type NodeId: NodeId + Send + 'static;
  /// Returns the identifier of this node.
  fn node_id(&self) -> Self::NodeId;
  