Update sync_wrapper to 1.0.0 from 0.1.1

... and fix CI.

examples/sse/src/main.rs

@@ -13,7 +13,7 @@ use axum::{
     routing::get,
     Router,
 };
-use axum_extra::{headers, TypedHeader};
+use axum_extra::TypedHeader;
 use futures::stream::{self, Stream};
 use std::{convert::Infallible, path::PathBuf, time::Duration};
 use tokio_stream::StreamExt as _;