CLSA-2026-1780972752 python3.11: Fix of CVE-2026-7210

CVE-2026-7210: seed pyexpat/elementtree with 16-byte XML hash salt via XMLSetHashSalt16Bytes; detect the symbol at runtime through a weak declaration so the fix engages against system libexpat 2.5.0 with the CVE-2026-41080 backport; add hard Requires on expat = 2.5.0-1.el92.tuxcare.els12...