gh-155978: Fix leak in update_slot_after_setattr() - #155979
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On free-threaded builds, update_slot_after_setattr() stack-allocates a single chunk to queue slot updates, assuming one setattr never needs more. However, update_subclasses() queues one update per affected subclass and so can require heap-allocated chunks. Free those chunks after the slots update.
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On free-threaded builds, update_slot_after_setattr() stack-allocates a single chunk to queue slot updates, assuming one setattr never needs more. However, update_subclasses() queues one update per affected subclass and so can require heap-allocated chunks. Free those chunks after the slots update.