[3.13] gh-148390: fix undefined behavior of `memoryview(...).cast("?")` (GH-148454) (GH-149299)

(cherry picked from commit 69e0a78e6edc3166c7a5b166955c0cefd1bacd5d)
(cherry picked from commit 454401c8e995dc15d5a096f35ff005746efcc915)

Co-authored-by: Stan Ulbrych <stan@python.org>
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>