Apply more clippy suggestions

Author: rami3l

download/tests/read-proxy-env.rs

@@ -74,8 +74,7 @@ fn socks_proxy_request() {
         let s = e.source().unwrap();
         assert!(
             s.to_string().contains("socks connect error"),
-            "Expected socks connect error, got: {}",
-            s.to_string()
+            "Expected socks connect error, got: {s}",
         );
         assert_eq!(CALL_COUNT.load(Ordering::SeqCst), 1);
     } else {

src/utils/utils.rs

@@ -151,7 +151,7 @@ pub(crate) fn download_file_with_resume(
     match download_file_(url, path, hasher, resume_from_partial, notify_handler) {
         Ok(_) => Ok(()),
         Err(e) => {
-            if let Some(_) = e.downcast_ref::<std::io::Error>() {
+            if e.downcast_ref::<std::io::Error>().is_some() {
                 return Err(e);
             }
             let is_client_error = match e.downcast_ref::<DEK>() {