graphics/exiv2: Update to 0.28.7
https://github.com/Exiv2/exiv2/blob/v0.28.7/doc/ChangeLog
MFH: 2025Q3
Security: 84a77710-8958-11f0-b6e5-4ccc6adda413,
340dc4c1-895a-11f0-b6e5-4ccc6adda413
(cherry picked from commit 211b462370eb9911d20c08933a668991fba006b9)