[3.10] Upgrade bundled libexpat to 2.6.0 (GH-115399) (GH-115468) (#115473)

Manual backport due to code differences.
(cherry picked from commit e071b0d558b2f5cddd5a9fc6afadb4ba109ec77e)

Co-authored-by: Seth Michael Larson <seth@python.org>

Miss Islington (bot) committed 2y ago

d0524caed0f3b77f271640460d0dff1a4c784087

Parent: 17a6533

Committed by GitHub <noreply@github.com> on 2/19/2024, 2:58:39 PM