tests: fix http3 tests

Author: seanmonstar

tests/client.rs

@@ -89,7 +89,7 @@ async fn donot_set_content_length_0_if_have_no_body() {
 async fn http3_request_full() {
     use http_body_util::BodyExt;
 
-    let server = server::http3(move |_req| async move {
+    let server = server::http3(move |req| async move {
         assert_eq!(req.headers()[CONTENT_LENGTH], "5");
         let reqb = req.collect().await.unwrap().to_bytes();
         assert_eq!(reqb, "hello");