gh-111178: fix UBSan failures in Modules/{blake2,md5,sha1,sha2,sha3}module.c - #128248

gh-111178: fix UBSan failures in Modules/{blake2,md5,sha1,sha2,sha3}module.c#128248

encukou merged 14 commits into

python:mainpython/cpython:mainfrom

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