Merge branch '6.4' into 7.0

* 6.4: (23 commits)
  fix merge
  add missing return type-hints
  fix merge
  explicitly mark nullable parameters as nullable
  fix low deps tests
  [HttpKernel] Fix datacollector caster for reference object property
  [Serializer] Fixing PHP warning in the ObjectNormalizer with MaxDepth enabled
  bug #51578 [Cache] always select database for persistent redis connections
  [Security] Validate that CSRF token in form login is string similar to username/password
  [Serializer] Use explicit nullable type
  [validator] validated Dutch translation
  Improve dutch translations
  [Translation] Skip state=needs-translation entries only when source == target
  [HttpKernel] Ensure controllers are not lazy
  [Validator] Fill in trans-unit id 113: This URL does not contain a TLD.
  [Validator] added missing Polish translation for unit 113
  [Validator] add missing lv translation
  [HttpClient] Let curl handle transfer encoding
  [Messenger] Make Doctrine connection ignore unrelated tables on setup
  [HttpFoundation] Set content-type header in RedirectResponse
  ...

Author: xabbuh

DependencyInjection/FrameworkExtension.php

@@ -1481,7 +1481,7 @@ private function registerTranslatorConfiguration(array $config, ContainerBuilder
         $defaultDir = $container->getParameterBag()->resolveValue($config['default_path']);
         foreach ($container->getParameter('kernel.bundles_metadata') as $name => $bundle) {
             if ($container->fileExists($dir = $bundle['path'].'/Resources/translations') || $container->fileExists($dir = $bundle['path'].'/translations')) {
-                $dirs[] = $dir;
+                $dirs[] = $transPaths[] = $dir;
             } else {
                 $nonExistingDirs[] = $dir;
             }

Resources/config/serializer.php

@@ -138,6 +138,8 @@
                 service('property_info')->ignoreOnInvalid(),
                 service('serializer.mapping.class_discriminator_resolver')->ignoreOnInvalid(),
                 null,
+                [],
+                service('property_info')->ignoreOnInvalid(),
             ])
 
         ->set('serializer.denormalizer.array', ArrayDenormalizer::class)