graphics/ImageMagick: update to 7.1.2-25

Changes: https://github.com/ImageMagick/ImageMagick/compare/7.1.2-24...7.1.2-25
Security: CVE-2026-53460
Security: CVE-2026-53461
Security: CVE-2026-53462
Security: CVE-2026-53463
Security: CVE-2026-53464
Security: CVE-2026-53465
PR: 296190

(cherry picked from commit 320e46a6cee979c670baccc76382d9f3f7538bdf)