security/vuxml: Update ghostscript CVE-2023-28879 entry

and mark ghostscript9-agpl-base 9.56.1_10 as fixed,
and remove ghostscript9-agpl-x11 which does not seem to be
using the vulnerable code.

Security: 25872b25-da2d-11ed-b715-a1e76793953b
Security: CVE-2023-28879
PR: 270823