scope/023: fix test to use delay() instead of suspend() for reliable timeout testing

suspend() only yields one tick and is not guaranteed to outlive a short timeout,
making the test fragile. Replace with delay(1000) so the coroutine is genuinely
blocked when the timeout fires. Also add suspend() after cancel() to let
cancellation propagate before checking isFinished().

Author: EdmondDantes

tests/scope/023-scope_awaitCompletion_timeout.phpt

@@ -6,6 +6,7 @@ Scope: awaitCompletion() - timeout handling
 use function Async\spawn;
 use function Async\suspend;
 use function Async\timeout;
+use function Async\delay;
 use function Async\await;
 use Async\Scope;
 
@@ -16,9 +17,7 @@ $scope = Scope::inherit();
 
 $long_running = $scope->spawn(function() {
     echo "long running coroutine started\n";
-    suspend();
-    suspend();
-    suspend();
+    delay(1000);
     echo "long running coroutine finished\n";
     return "delayed_result";
 });
@@ -40,6 +39,7 @@ await($external);
 
 // Cancel the long running coroutine to clean up
 $long_running->cancel();
+suspend(); // Allow cancellation to propagate
 
 echo "scope finished: " . ($scope->isFinished() ? "true" : "false") . "\n";
 
@@ -51,7 +51,6 @@ start
 spawned long running coroutine
 long running coroutine started
 external waiting with timeout
-long running coroutine finished
 caught timeout as expected
 scope finished: true
 end