[Deprecated] Mapping AbstractEntity getIterator method return type

[emololftw]

PHP 8.1 deprecated stuff in src\Mapping\Request\AbstractEntity.php on line 20

fix:

from
public function getIterator(): iterable

into
public function getIterator(): \Traversable

PS: im newbie with git and stuff around, i hope its helpfull tip.
Have a nice day!