test: ignore deprecations on legacy denormalize tests

#[IgnoreDeprecations] is required alongside expectUserDeprecationMessage()
so --fail-on-deprecation does not flag the asserted deprecation in
serializer/json-api ItemNormalizer/ItemDenormalizer tests.

Author: soyuka

src/JsonApi/Tests/Serializer/ItemDenormalizerTest.php

@@ -21,6 +21,7 @@
 use ApiPlatform\Metadata\Property\Factory\PropertyNameCollectionFactoryInterface;
 use ApiPlatform\Metadata\ResourceClassResolverInterface;
 use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\IgnoreDeprecations;
 use PHPUnit\Framework\TestCase;
 use Prophecy\PhpUnit\ProphecyTrait;
 use Symfony\Component\Serializer\Exception\NotNormalizableValueException;
@@ -53,6 +54,7 @@ public function testSupportsDenormalizationOnlyForJsonApiFormat(): void
     }
 
     #[Group('legacy')]
+    #[IgnoreDeprecations]
     public function testDenormalizeOnLegacyItemNormalizerIsDeprecated(): void
     {
         $this->expectUserDeprecationMessage('Since api-platform/core 4.4: Calling "denormalize()" on "ApiPlatform\JsonApi\Serializer\ItemNormalizer" is deprecated, use "ApiPlatform\JsonApi\Serializer\ItemDenormalizer" instead.');

src/Serializer/Tests/ItemNormalizerTest.php

@@ -22,6 +22,7 @@
 use ApiPlatform\Serializer\ItemNormalizer;
 use ApiPlatform\Serializer\Tests\Fixtures\ApiResource\Dummy;
 use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\IgnoreDeprecations;
 use PHPUnit\Framework\TestCase;
 use Prophecy\Argument;
 use Prophecy\PhpUnit\ProphecyTrait;
@@ -146,6 +147,7 @@ public function testNormalizeWithDefinedIri(): void
     }
 
     #[Group('legacy')]
+    #[IgnoreDeprecations]
     public function testDenormalizeIsDeprecated(): void
     {
         $this->expectUserDeprecationMessage('Since api-platform/core 4.4: Calling "denormalize()" on "ApiPlatform\Serializer\ItemNormalizer" is deprecated, use "ApiPlatform\Serializer\ItemDenormalizer" instead.');