[Update]: Linux Kernel LTS emergency update

### Package name linux-cachyos-lts ### Current version 6.18.42 ### New version 6.18.43 ### Upstream source https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.18.43.tar.xz ### Reason for update Critical Spectre V2 Interruption Injection Flaw Vulnerabity correction update ### Additional context https://www.linuxcompatible.org/story/linux-kernel-61843-66149-and-61181-patches-new-spectre-v2-interrupt-injection-flaw/