Add void return type in MessageQueueCollector

Fixes:
```
Method "Symfony\Component\HttpKernel\DataCollector\DataCollectorInterface::collect()" might add "void" as a native return type declaration in the future. Do the same in implementation "Enqueue\Bundle\Profiler\MessageQueueCollector" now to avoid errors or add an explicit @return annotation to suppress this message.
```

pkg/enqueue-bundle/Profiler/MessageQueueCollector.php

@@ -4,11 +4,10 @@
 
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
-use Throwable;
 
 class MessageQueueCollector extends AbstractMessageQueueCollector
 {
-    public function collect(Request $request, Response $response, Throwable $exception = null)
+    public function collect(Request $request, Response $response, \Throwable $exception = null): void
     {
         $this->collectInternal($request, $response);
     }