Allow type-complexity in hyper.rs example

This isn't the prettiest, but suppressing the warning does make
the example warning free.

crates/arti-client/examples/hyper.rs

@@ -93,6 +93,7 @@ fn uri_to_host_port(uri: Uri) -> Result<(String, u16)> {
 impl<R: Runtime> Service<Uri> for ArtiHttpConnector<R> {
     type Response = ArtiHttpConnection;
     type Error = anyhow::Error;
+    #[allow(clippy::type_complexity)]
     type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send>>;
 
     fn poll_ready(&mut self, _: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {