Changed return type to void for `Hyperf\Event\Contract\ListenerInte…

…rface::process()`. (#4611)

src/Listener/BeforeMainServerStartListener.php

@@ -41,7 +41,7 @@ public function listen(): array
      * Handle the Event when the event is triggered, all listeners will
      * complete before the event is returned to the EventDispatcher.
      */
-    public function process(object $event)
+    public function process(object $event): void
     {
         // Init the consumer process.
         $consumerManager = $this->container->get(ConsumerManager::class);

src/Listener/MainWorkerStartListener.php

@@ -43,7 +43,7 @@ public function listen(): array
      * Handle the Event when the event is triggered, all listeners will
      * complete before the event is returned to the EventDispatcher.
      */
-    public function process(object $event)
+    public function process(object $event): void
     {
         // Declare exchange and routingKey
         $producerMessages = AnnotationCollector::getClassesByAnnotation(Producer::class);