Make clippy happy (#3350)

examples/sse/src/main.rs

@@ -85,19 +85,19 @@ mod tests {
         async fn spawn_app(host: impl Into<String>) -> String {
             let host = host.into();
             // Bind to localhost at the port 0, which will let the OS assign an available port to us
-            let listener = TcpListener::bind(format!("{}:0", host)).await.unwrap();
+            let listener = TcpListener::bind(format!("{host}:0")).await.unwrap();
             // Retrieve the port assigned to us by the OS
             let port = listener.local_addr().unwrap().port();
             tokio::spawn(async {
                 axum::serve(listener, app()).await.unwrap();
             });
             // Returns address (e.g. http://127.0.0.1{random_port})
-            format!("http://{}:{}", host, port)
+            format!("http://{host}:{port}")
         }
         let listening_url = spawn_app("127.0.0.1").await;
 
         let mut event_stream = reqwest::Client::new()
-            .get(format!("{}/sse", listening_url))
+            .get(format!("{listening_url}/sse"))
             .header("User-Agent", "integration_test")
             .send()
             .await