security/vuxml: fix up ghostscript version range of CVE-2023-28879

Pointy hat to: mandree@ for misreading the quoted Artifex page
Reported by: Nicholas Taylor <nicholas.e.taylor@gmail.com>
PR: 270823 (comment #3)
Security: CVE-2023-28879
Security: 25872b25-da2d-11ed-b715-a1e76793953b