cs fix

Author: nicolas-grekas

Tests/Kernel/ConcreteMicroKernel.php

@@ -79,7 +79,7 @@ protected function configureRoutes(RoutingConfigurator $routes): void
         $routes->add('danger', '/danger')->controller('kernel::dangerousAction');
     }
 
-    protected function configureContainer(ContainerBuilder $c, LoaderInterface $loader)
+    protected function configureContainer(ContainerBuilder $c, LoaderInterface $loader): void
     {
         $c->register('logger', NullLogger::class);
         $c->loadFromExtension('framework', [

Tests/Kernel/flex-style/src/FlexStyleMicroKernel.php

@@ -76,7 +76,7 @@ protected function configureRoutes(RoutingConfigurator $routes): void
         $routes->add('halloween', '/')->controller([$this, 'halloweenAction']);
     }
 
-    protected function configureContainer(ContainerConfigurator $c)
+    protected function configureContainer(ContainerConfigurator $c): void
     {
         $c->parameters()
             ->set('halloween', 'Have a great day!');