change command return type to void

Author: janvt

src/Maker/MakeCommand.php

@@ -54,7 +54,6 @@ function getEntityHandlerUseStatements(): array
     {
         return [
             CommandHandler::class,
-            Collection::class,
             AsMessageHandler::class
         ];
     }

src/Resources/skeleton/command/CommandHandler.tpl.php

@@ -7,7 +7,7 @@
 #[AsMessageHandler]
 class <?= $class_name ?> implements CommandHandler
 {
-    public function __invoke(<?= $query_class_name ?> $query): Collection
+    public function __invoke(<?= $query_class_name ?> $query): void
     {
     }
 }