[3.12] gh-144363: Update bundled libexpat to 2.7.4 (GH-144365) (#144501)

(cherry picked from commit d5cb9f6a9b6f48cc08c4422259498d4fd023357a)
This also backports commit: 51d309988b3041cae20cca89172b4fd825c9a1cc

Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
Co-authored-by: Gregory P. Smith <greg@krypto.org>
Co-authored-by: Petr Viktorin <encukou@gmail.com>

Miss Islington (bot) committed 2mo ago

1899a025991a0b7895362e3c6ca13b6d8500cc56

Parent: 9fc477c

Committed by GitHub <noreply@github.com> on 2/23/2026, 4:10:49 PM