[3.13] gh-126240: handle `NULL` returned by `_Py_asdl_expr_seq_new` (GH-126241) (#126243)

gh-126240: handle `NULL` returned by  `_Py_asdl_expr_seq_new` (GH-126241)

check return value of `_Py_asdl_expr_seq_new`
(cherry picked from commit 94639f6b7182c2e1a82f2f907b03b5b15202acfa)

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>