fix: php 8.2 dynamic property warning in MapFieldIter #11485
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addresses #11243
Defines
$key_type
inMapFieldIter
, so as not to trigger PHP 8.2 warning. Note that this will change the visibility of$key_type
from public in previous versions to private in this version. This is a breaking change, but anyone using$key_type
in this way is misusing the library, so I think it's acceptable.