[bug] Moph property of morphable class always has default value

[litvintroll]

✏️ Describe the bug
Issue with PropertyMorphableData Data class
The nullable enum type field (default: null) is always null inside morph() method eventhough property was correctly resolved.
DataMorphClassResolver is not handling this case in a proper way.

↪️ To Reproduce

it('can resolve morph class with backed enum type ignoring default value', function () {
    abstract class TestAbstractMorphableDataWithNullableBackedEnum extends Data implements PropertyMorphableData
    {
        #[PropertyForMorph]
        public ?DummyBackedEnum $type = null;

        public static function morph(array $properties): ?string
        {
            return $properties['type']?->value;
        }
    };

    $morph = app(DataMorphClassResolver::class)->execute(
        app(DataConfig::class)->getDataClass(TestAbstractMorphableDataWithNullableBackedEnum::class),
        [['type' => DummyBackedEnum::FOO]]
    );

    expect($morph)->toBe(DummyBackedEnum::FOO->value);
});

Debuging \Spatie\LaravelData\Resolvers\DataMorphClassResolver::execute:
Resolved property value

replaced with default 'null'

✅ Expected behavior
The default value must not be applied in case the field was correctly resolved.

🖥️ Versions

Laravel: 12
Laravel Data: 4.18
PHP: 8.4.4