MGASA-2021-0435 Updated python3 packages fix security vulnerability

bpo-42278: Replaced usage of tempfile.mktemp with TemporaryDirectory to avoid a potential race condition. bpo-44394: 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. bpo-43124...