Merge branch '3.4' into 4.4

* 3.4:
  remove superfluous cast
  Change 'cache_key' to AbstractRendererEngine::CACHE_KEY_VAR
  Upgrade PHPUnit to 8.5 (php 7.2) and 9.3 (php >= 7.3).

Author: fabpot

Extension/Core/Type/BaseType.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Component\Form\Extension\Core\Type;
 
+use Symfony\Component\Form\AbstractRendererEngine;
 use Symfony\Component\Form\AbstractType;
 use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\Form\FormInterface;
@@ -111,7 +112,7 @@ public function buildView(FormView $view, FormInterface $form, array $options)
             // collection form have different types (dynamically), they should
             // be rendered differently.
             // https://github.com/symfony/symfony/issues/5038
-            'cache_key' => $uniqueBlockPrefix.'_'.$form->getConfig()->getType()->getBlockPrefix(),
+            AbstractRendererEngine::CACHE_KEY_VAR => $uniqueBlockPrefix.'_'.$form->getConfig()->getType()->getBlockPrefix(),
         ]);
     }
 

composer.json

@@ -27,7 +27,7 @@
     },
     "require-dev": {
         "doctrine/collections": "~1.0",
-        "symfony/validator": "^3.4.31|^4.3.4|^5.0",
+        "symfony/validator": "^3.4.44|^4.3.4|^5.0",
         "symfony/dependency-injection": "^3.4|^4.0|^5.0",
         "symfony/expression-language": "^3.4|^4.0|^5.0",
         "symfony/config": "^3.4|^4.0|^5.0",