fix: apply automatic clippy fixes across workspace

stub/tests/negative_scenarios.rs

@@ -31,8 +31,7 @@ async fn test_stub_connection_refused() {
 
     assert!(
         res.is_ok(),
-        "Stub hung on connection refused! Took {:?}",
-        elapsed
+        "Stub hung on connection refused! Took {elapsed:?}"
     );
 }
 
@@ -65,7 +64,7 @@ async fn test_stub_handles_eof_cleanly() {
     let res = tokio::time::timeout(Duration::from_secs(5), child.wait()).await;
     let elapsed = start.elapsed();
 
-    assert!(res.is_ok(), "Stub hung after EOF! Took {:?}", elapsed);
+    assert!(res.is_ok(), "Stub hung after EOF! Took {elapsed:?}");
 }
 
 #[tokio::test]
@@ -102,7 +101,6 @@ async fn test_stub_sse_fallback_failure() {
 
     assert!(
         res.is_ok(),
-        "Stub hung on fallback failure! Took {:?}",
-        elapsed
+        "Stub hung on fallback failure! Took {elapsed:?}"
     );
 }