Merge pull request #50 from reactphp-parallel/2.x-queue-deferred-reso…

…lve-null

Pass NULL into deferred resolve call

src/Limited.php

@@ -55,7 +55,7 @@ public function run(Closure $callable, array $args = []): mixed
 
         if ($this->idleRuntimes === 0) {
             $deferred = new Deferred();
-            $this->queue->enqueue([$deferred, 'resolve']);
+            $this->queue->enqueue(static fn () => $deferred->resolve(null));
 
             await($deferred->promise());
         }