[3.13] gh-130547: Fix race between dict_dealloc and split_keys_entry_added (gh-130778) (gh-130833)

gh-130547: Fix race between dict_dealloc and split_keys_entry_added (gh-130778)
(cherry picked from commit 80e6d3ec4972220587c8b883161311a49ea8d0ff)

Co-authored-by: Donghee Na <donghee.na@python.org>