bug #465 [Maintenance] Downgrade rector to fix build (lchrusciel)

This PR was merged into the 1.10 branch.

Discussion
----------

| Q               | A
| --------------- | -----
| Bug fix?        | yes
| New feature?    | no
| BC breaks?      | no
| Deprecations?   | 
| Related tickets | continuation of #464
| License         | MIT


Commits
-------

01cefe3 [Maintenance] Downgrade rector to fix build
f070dcb [Maintenance] Remove redundant checks according to psalm

composer.json

@@ -77,7 +77,7 @@
         "symplify/easy-coding-standard": "^10.2",
         "twig/twig": "^2.12 || ^3.0",
         "vimeo/psalm": "^4.22",
-        "rector/rector": "^0.13.6"
+        "rector/rector": "^0.12.20"
     },
     "suggest": {
         "doctrine/orm": "^2.5",

src/Bundle/Form/Type/ResourceTranslationsType.php

@@ -48,8 +48,6 @@ public function buildForm(FormBuilderInterface $builder, array $options): void
             /** @var TranslatableInterface $translatable */
             $translatable = $parentForm->getData();
 
-            Assert::nullOrIsInstanceOf($translatable, TranslatableInterface::class);
-
             foreach ($translations as $localeCode => $translation) {
                 if (null === $translation) {
                     unset($translations[$localeCode]);

src/Bundle/Validator/UniqueWithinCollectionConstraintValidator.php

@@ -29,8 +29,6 @@ public function validate(mixed $value, Constraint $constraint): void
         $propertyAccessor = PropertyAccess::createPropertyAccessor();
         $collectionOfEntitiesCodes = [];
 
-        Assert::isIterable($value);
-
         foreach ($value as $key => $entity) {
             /** @var int|string|null $checkingAttribute */
             $checkingAttribute = $propertyAccessor->getValue($entity, $constraint->attributePath);
@@ -39,15 +37,6 @@ public function validate(mixed $value, Constraint $constraint): void
                 continue;
             }
 
-            if (!is_string($checkingAttribute) && !is_int($checkingAttribute)) {
-                throw new \InvalidArgumentException(
-                    \sprintf(
-                        'Expected a string or integer. Got: %s',
-                        \is_object($checkingAttribute) ? \get_class($checkingAttribute) : \gettype($checkingAttribute),
-                    ),
-                );
-            }
-
             if (!array_key_exists($checkingAttribute, $collectionOfEntitiesCodes)) {
                 $collectionOfEntitiesCodes[$checkingAttribute] = $key;