Changed return type to void for Hyperf\Event\Contract\ListenerInterface::process(). (#4611)

Author: limingxinleo

src/Listener/RegisterProtocolListener.php

@@ -37,7 +37,7 @@ public function listen(): array
      * All official rpc protocols should register in here,
      * and the others non-official protocols should register in their own component via listener.
      */
-    public function process(object $event)
+    public function process(object $event): void
     {
         $this->protocolManager->register(Constant::PROTOCOL_DEFAULT, [
             'packer' => JsonPacker::class,

src/Listener/RegisterServiceListener.php

@@ -35,7 +35,7 @@ public function listen(): array
      *
      * @param AfterPathRegister $event
      */
-    public function process(object $event)
+    public function process(object $event): void
     {
         $annotation = $event->annotation;
         if (! in_array($annotation->protocol, $this->getProtocols(), true)) {