Merge topic 'update-expat'

b08cb30f2e Merge branch 'upstream-expat' into update-expat
60f52ff4c5 expat 2025-09-24 (4575e52f)
c03fa7349c expat: Update script to get Expat 2.7.3

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !11639