gh-112625: Protect bytearray from being freed by misbehaving iterator inside bytearray.join#112626

serhiy-storchaka merged 5 commits intopython:mainpython/cpython:mainfrom

chilaxan:fix-bytearray.join-Read-After-Freechilaxan/cpython:fix-bytearray.join-Read-After-FreeCopy head branch name to clipboard