Merge branch '3.4' into 4.1

* 3.4:
  [HttpFoundation] Check file exists before unlink
  [Console] Fixed #29835: ConfirmationQuestion with default true for answer '0'
  [Translation] Concatenated translation messages
  [Form] ensure compatibility with older PHPUnit mocks
  [Serializer] Docblock about throwing exceptions on serializer
  [Debug][ErrorHandler] Preserve our error handler when a logger set another one
  [Form] Changed UrlType input type to text when default_protocol is not null
  [Bugfix] MemcachedSessionHandler::close() must close connection

Tests/Controller/ControllerTraitTest.php

@@ -15,6 +15,7 @@
 use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 use Symfony\Component\DependencyInjection\Container;
 use Symfony\Component\Form\Form;
+use Symfony\Component\Form\FormConfigInterface;
 use Symfony\Component\HttpFoundation\BinaryFileResponse;
 use Symfony\Component\HttpFoundation\File\File;
 use Symfony\Component\HttpFoundation\JsonResponse;
@@ -487,8 +488,7 @@ public function testCreateNotFoundException()
 
     public function testCreateForm()
     {
-        $config = $this->getMockBuilder('Symfony\Component\Form\FormConfigInterface')->getMock();
-        $form = new Form($config);
+        $form = new Form($this->getMockBuilder(FormConfigInterface::class)->getMock());
 
         $formFactory = $this->getMockBuilder('Symfony\Component\Form\FormFactoryInterface')->getMock();
         $formFactory->expects($this->once())->method('create')->willReturn($form);

composer.json

@@ -39,7 +39,7 @@
         "symfony/dom-crawler": "~3.4|~4.0",
         "symfony/polyfill-intl-icu": "~1.0",
         "symfony/security": "~3.4|~4.0",
-        "symfony/form": "^4.1",
+        "symfony/form": "^4.1.11|^4.2.3",
         "symfony/expression-language": "~3.4|~4.0",
         "symfony/messenger": "^4.1",
         "symfony/process": "~3.4|~4.0",