ci: update clippy version to 1.75 (#6273)

tokio-util/tests/compat.rs

@@ -1,4 +1,4 @@
-#![cfg(all(feature = "compat"))]
+#![cfg(feature = "compat")]
 #![cfg(not(target_os = "wasi"))] // WASI does not support all fs operations
 #![warn(rust_2018_idioms)]
 

tokio-util/tests/mpsc.rs

@@ -29,7 +29,7 @@ async fn simple() {
 
 #[tokio::test]
 async fn simple_ref() {
-    let v = vec![1, 2, 3i32];
+    let v = [1, 2, 3i32];
 
     let (send, mut recv) = channel(3);
     let mut send = PollSender::new(send);

tokio-util/tests/spawn_pinned.rs

@@ -31,7 +31,7 @@ fn can_drop_future_and_still_get_output() {
     let pool = task::LocalPoolHandle::new(1);
     let (sender, receiver) = std::sync::mpsc::channel();
 
-    let _ = pool.spawn_pinned(move || {
+    pool.spawn_pinned(move || {
         // Rc is !Send + !Sync
         let local_data = Rc::new("test");
 
@@ -209,7 +209,7 @@ async fn spawn_by_idx() {
         },
         0,
     );
-    let _ = pool.spawn_pinned_by_idx(
+    pool.spawn_pinned_by_idx(
         || async move {
             barrier2.wait().await;
             std::thread::current().id()