Depend on futures-util instead of futures

tests/cycle_prevention.rs

@@ -4,7 +4,6 @@
 //! prevents it through the type-state pattern.
 
 use dagx::{task, DagRunner, TaskHandle};
-use futures::FutureExt;
 
 /// Demonstrates that TaskBuilder is consumed by depends_on,
 /// preventing you from wiring the same task multiple times
@@ -271,7 +270,7 @@ async fn test_type_safety_prevents_invalid_graphs() {
     let result = dag.add_task(Aggregate).depends_on((&t1, &t2));
 
     // Execute and verify
-    dag.run(|fut| tokio::spawn(fut).map(Result::unwrap))
+    dag.run(|fut| async move { tokio::spawn(fut).await.unwrap() })
         .await
         .unwrap();