CLSA-2024-1724266264 grub2: Fix of 12 CVEs

Fix package version number - Use CloudLinux vendor cert - Make this package installable only on a system having Cloudlinux signed components: grub2 and kernel - Add patches from centos-8.5 ELS: - CVE-2021-3695: out-of-bounds write in the heap area by a crafted 16-bit grayscale PNG image -...