[3.12] gh-149017: Upgrade bundled Expat to 2.8.0 (GH-149020) (GH-149073) (#150007)

[3.14] gh-149017: Upgrade bundled Expat to 2.8.0 (GH-149020) (GH-149073)
(cherry picked from commit c181c5fa16273f0cc4d7ed20a016e0921f60fdfd)


(cherry picked from commit 005555a3f0ae20ee8154eb4ee172e1e355144c8c)

Co-authored-by: Stan Ulbrych <stan@python.org>