fix(symfony): autoconfiguration on UriVariableTransformerInterface (#6159)

Author: vincentchalamon

Diff for: src/Symfony/Bundle/DependencyInjection/ApiPlatformExtension.php

@@ -31,6 +31,7 @@
 use ApiPlatform\GraphQl\Type\Definition\TypeInterface as GraphQlTypeInterface;
 use ApiPlatform\Metadata\ApiResource;
 use ApiPlatform\Metadata\FilterInterface;
+use ApiPlatform\Metadata\UriVariableTransformerInterface;
 use ApiPlatform\Metadata\UrlGeneratorInterface;
 use ApiPlatform\Metadata\Util\Inflector;
 use ApiPlatform\State\ApiResource\Error;
@@ -171,6 +172,8 @@ public function load(array $configs, ContainerBuilder $container): void
             ->addTag('api_platform.state_provider');
         $container->registerForAutoconfiguration(ProcessorInterface::class)
             ->addTag('api_platform.state_processor');
+        $container->registerForAutoconfiguration(UriVariableTransformerInterface::class)
+            ->addTag('api_platform.uri_variables.transformer');
 
         if (!$container->has('api_platform.state.item_provider')) {
             $container->setAlias('api_platform.state.item_provider', 'api_platform.state_provider.object');