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: Łukasz Langa <lukasz@langa.pl>

Victor Stinner committed 4y ago

3fc5d84046ddbd66abac5b598956ea34605a4e5d

Parent: c9227df

Committed by GitHub <noreply@github.com> on 8/29/2021, 2:08:24 PM