Traits can use the Deprecated attribute on PHP 8.5+

[ondrejmirtes]

RFC: https://wiki.php.net/rfc/deprecated_traits

Unfortunately we have to add the TARGET_CLASS constant. From the RFC:

The #[\Deprecated] attribute will be allowed on traits. Since Attribute::TARGET_CLASS includes traits as well as classes, interfaces, and enums, a validator will be used to ensure that when applied to a “class” (zend_class_entry), it must correspond to a trait.