[3.13] gh-126980: Fix `bytearray.__buffer__` crash on `PyBUF_{READ,WRITE}` (GH-126981) (#127023)

(cherry picked from commit 3932e1db5353bbcf3e3c1133cc9d2cde654cb645)

Co-authored-by: Victor Stinner <vstinner@python.org>
3 files changed