bpo-44394: Update libexpat copy to 2.4.1 (GH-26945)

Update the vendored copy of libexpat to 2.4.1 (from 2.2.8) to get the
fix for the CVE-2013-0340 "Billion Laughs" vulnerability. This copy
is most used on Windows and macOS.

Co-authored-by: Ɓukasz Langa <lukasz@langa.pl>
22 files changed