more missing return types

Author: smnandre

src/Dropzone/src/DependencyInjection/DropzoneExtension.php

@@ -25,7 +25,7 @@
  */
 class DropzoneExtension extends Extension implements PrependExtensionInterface
 {
-    public function prepend(ContainerBuilder $container)
+    public function prepend(ContainerBuilder $container): void
     {
         // Register the Dropzone form theme if TwigBundle is available
         $bundles = $container->getParameter('kernel.bundles');

src/StimulusBundle/src/DependencyInjection/StimulusExtension.php

@@ -43,7 +43,7 @@ public function load(array $configs, ContainerBuilder $container): void
         }
     }
 
-    public function prepend(ContainerBuilder $container)
+    public function prepend(ContainerBuilder $container): void
     {
         if (!$this->isAssetMapperAvailable($container)) {
             return;

src/Translator/src/DependencyInjection/UxTranslatorExtension.php

@@ -27,7 +27,7 @@
  */
 class UxTranslatorExtension extends Extension implements PrependExtensionInterface
 {
-    public function load(array $configs, ContainerBuilder $container)
+    public function load(array $configs, ContainerBuilder $container): void
     {
         $configuration = new Configuration();
         $config = $this->processConfiguration($configuration, $configs);
@@ -46,7 +46,7 @@ public function load(array $configs, ContainerBuilder $container)
         }
     }
 
-    public function prepend(ContainerBuilder $container)
+    public function prepend(ContainerBuilder $container): void
     {
         if (!$this->isAssetMapperAvailable($container)) {
             return;