pkg: arch: Update to kernel 6.6.4

pkg/arch/kernel/PKGBUILD

@@ -3,7 +3,7 @@
 # Maintainer: Jan Alexander Steffens (heftig) <jan.steffens@gmail.com>
 
 pkgbase=linux-surface
-pkgver=6.6.1.arch1
+pkgver=6.6.4.arch1
 pkgrel=1
 pkgdesc='Linux'
 _shortver=${pkgver%.*}