Symfony version(s) affected

7.1.1

Description

When I have simple DTO with property that has data type mixed

class MixedTypeConstructorDto
{
    public function __construct(
        //phpcs:ignore SlevomatCodingStandard.Classes.RequireSingleLineMethodSignature.RequiredSingleLineSignature
        #[Groups(["api"])]
        public mixed $mixed,
    ) {
    }
}

deserialization is failing on call to undefined function is_mixed. I can see this is already fixed in https://github.com/symfony/serializer/blob/7.1/Normalizer/AbstractObjectNormalizer.php but no new version was released so can we please release it?

How to reproduce

Deserialize anything to class with mixed property

Possible Solution

No response

Additional Context

No response