SUSE-SU-2025:4305-1 Security update for grub2

This update for grub2 fixes the following issues: - CVE-2025-54771: Fixed rubfileclose does not properly controls the fs refcount bsc1252931 - CVE-2025-54770: Fixed missing unregister call for netsetvlan command may lead to use-after-free bsc1252930 - CVE-2025-61662: Fixed missing unregister call...