host framenix: linux 6.8-rc6 -> 6.8.0 from nixpkgs again

Flake lock file updates:

• Updated input 'nixos-unstable':
    'github:NixOS/nixpkgs/3030f185ba6a4bf4f18b87f345f104e6a6961f34' (2024-03-09)
  → 'github:NixOS/nixpkgs/0ad13a6833440b8e238947e47bea7f11071dc2b2' (2024-03-12)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/ddcd7598b2184008c97e6c9c6a21c5f37590b8d2' (2024-03-11)
  → 'github:NixOS/nixpkgs/51063ed4f2343a59fdeebb279bb81d87d453942b' (2024-03-12)

flake.lock

@@ -190,11 +190,11 @@
     },
     "nixos-unstable": {
       "locked": {
-        "lastModified": 1709237383,
-        "narHash": "sha256-cy6ArO4k5qTx+l5o+0mL9f5fa86tYUX3ozE1S+Txlds=",
+        "lastModified": 1710272261,
+        "narHash": "sha256-g0bDwXFmTE7uGDOs9HcJsfLFhH7fOsASbAuOzDC+fhQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "1536926ef5621b09bba54035ae2bb6d806d72ac8",
+        "rev": "0ad13a6833440b8e238947e47bea7f11071dc2b2",
         "type": "github"
       },
       "original": {
@@ -238,11 +238,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1709309926,
-        "narHash": "sha256-VZFBtXGVD9LWTecGi6eXrE0hJ/mVB3zGUlHImUs2Qak=",
+        "lastModified": 1710283656,
+        "narHash": "sha256-nI+AOy4uK6jLGBi9nsbHjL1EdSIzoo8oa+9oeVhbyFc=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "79baff8812a0d68e24a836df0a364c678089e2c7",
+        "rev": "51063ed4f2343a59fdeebb279bb81d87d453942b",
         "type": "github"
       },
       "original": {

hosts/framenix/default.nix

@@ -20,16 +20,7 @@ in
   systemd.services.nix-daemon.environment.TMPDIR = "/var/tmp";
 
   # try newer kernels
-  boot.kernelPackages = pkgs.linuxPackagesFor (pkgs.linux_latest.override {
-    argsOverride = rec {
-      src = pkgs.fetchurl {
-        url = "https://git.kernel.org/torvalds/t/linux-${version}.tar.gz";
-        hash = "sha256-GhuvgL4gfMB6ONL8NI48WWJJAPBYT+6vFS8OwGkKz74=";
-      };
-      version = "6.8-rc6";
-      modDirVersion = "6.8.0-rc6";
-    };
-  });
+  boot.kernelPackages = pkgs.linuxPackages_latest;
 
   boot.kernelParams = [ 
     # temporary workaround for white flickering graphics artefacts