Change underlying type for StringValue pseudo type

[astronom]

Seems that it is a mistake that StringValue is Float_

In my project I use symfony/serializer with phpdocumentor/reflection-docblock and after upgrade the deserialization of this code sample does not work correctly, because the underlying type of $order is not a String_

final class OrderBy
{
    /**
     * @param 'ASC'|'DESC' $order
     */
    public function __construct(
        private readonly string $order,
    ) {
    }

    /**
     * @return 'ASC'|'DESC'
     */
    public function getOrder(): string
    {
        return $this->order;
    }
}

[astronom]

@jaapio plz check this MR

[astronom]

@jaapio plz find a few minutes to check this

[jaapio]

Thanks for reminding me. This is merge by now

[jaapio]

I just created 1.7.2 as bugfix release. Thanks for your contribution!