minor symfony#54626 [Serializer] add missing return type-hints (xabbuh)

This PR was merged into the 7.0 branch.

Discussion
----------

[Serializer] add missing return type-hints

| Q             | A
| ------------- | ---
| Branch?       | 7.0
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Issues        |
| License       | MIT

Commits
-------

47695d2 add missing return type-hints

Author: xabbuh

src/Symfony/Component/Serializer/Normalizer/AbstractNormalizer.php

@@ -250,7 +250,7 @@ protected function getGroups(array $context): array
     /**
      * Is this attribute allowed?
      */
-    protected function isAllowedAttribute(object|string $classOrObject, string $attribute, ?string $format = null, array $context = [])
+    protected function isAllowedAttribute(object|string $classOrObject, string $attribute, ?string $format = null, array $context = []): bool
     {
         $ignoredAttributes = $context[self::IGNORED_ATTRIBUTES] ?? $this->defaultContext[self::IGNORED_ATTRIBUTES];
         if (\in_array($attribute, $ignoredAttributes)) {

src/Symfony/Component/Serializer/Normalizer/GetSetMethodNormalizer.php

@@ -158,7 +158,7 @@ protected function setAttributeValue(object $object, string $attribute, mixed $v
         }
     }
 
-    protected function isAllowedAttribute($classOrObject, string $attribute, ?string $format = null, array $context = [])
+    protected function isAllowedAttribute($classOrObject, string $attribute, ?string $format = null, array $context = []): bool
     {
         if (!parent::isAllowedAttribute($classOrObject, $attribute, $format, $context)) {
             return false;

src/Symfony/Component/Serializer/Normalizer/ObjectNormalizer.php

@@ -171,7 +171,7 @@ protected function getAllowedAttributes(string|object $classOrObject, array $con
         return $allowedAttributes;
     }
 
-    protected function isAllowedAttribute($classOrObject, string $attribute, ?string $format = null, array $context = [])
+    protected function isAllowedAttribute($classOrObject, string $attribute, ?string $format = null, array $context = []): bool
     {
         if (!parent::isAllowedAttribute($classOrObject, $attribute, $format, $context)) {
             return false;