[3.11] gh-94438: in frameobject's mark_stacks switch, the PUSH_EXC_INFO and POP_EXCEPT cases are no longer reachable (GH-94582) (GH-94595)

(cherry picked from commit 50b9a776)

Co-authored-by: Irit Katriel <1055913+iritkatriel@users.noreply.github.com>