[3.10] gh-149698: Update bundled expat to 2.8.1 (GH-149699) (GH-150020)\n\ngh-149698: Update bundled expat to 2.8.1 (GH-149699)\n(cherry picked from commit f1a47e79fb7081d3cde6364530bfa98240ebbe4c)\n(cherry picked from commit 2dd5ce8718c58d76c2921e6f334a977e5db406b3)\n\nCo-authored-by: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>\nCo-authored-by: Stan Ulbrych <stan@python.org> · python/cpython@002703b