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GH-93990: fix refcounting bug in `add_subclass` in `typeobject.c` (GH-93989)

(cherry picked from commit 726448ebe15cd78e180c29c9858cb6c10a581524)

Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>
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Miss Islington (bot) committed
15c8838273e1be94dc3f32db21a35f5302ed1a1d
Parent: 0c826d3
Committed by GitHub <noreply@github.com> on 6/19/2022, 9:51:22 AM