framenix: pin to kernel 6.8 due to virtualbox

Flake lock file updates:

• Updated input 'nixos-unstable':
    'github:NixOS/nixpkgs/f1010e0469db743d14519a1efd37e23f8513d714' (2024-05-09)
  → 'github:NixOS/nixpkgs/33d1e753c82ffc557b4a585c77de43d4c922ebb5' (2024-05-15)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/9a9960b98418f8c385f52de3b09a63f9c561427a' (2024-05-09)
  → 'github:NixOS/nixpkgs/9ddcaffecdf098822d944d4147dd8da30b4e6843' (2024-05-14)
• Updated input 'nur':
    'github:nix-community/NUR/65995cfffcbd9dff156f4807002201a7c913b9ef' (2024-05-10)
  → 'github:nix-community/NUR/ff15e8c091246f611200d40e265f60b381289fc6' (2024-05-16)

flake.lock

@@ -210,11 +210,11 @@
     },
     "nixos-unstable": {
       "locked": {
-        "lastModified": 1715266358,
+        "lastModified": 1715787315,
-        "narHash": "sha256-doPgfj+7FFe9rfzWo1siAV2mVCasW+Bh8I1cToAXEE4=",
+        "narHash": "sha256-cYApT0NXJfqBkKcci7D9Kr4CBYZKOQKDYA23q8XNuWg=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "f1010e0469db743d14519a1efd37e23f8513d714",
+        "rev": "33d1e753c82ffc557b4a585c77de43d4c922ebb5",
         "type": "github"
       },
       "original": {
@@ -258,11 +258,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1715218190,
+        "lastModified": 1715668745,
-        "narHash": "sha256-R98WOBHkk8wIi103JUVQF3ei3oui4HvoZcz9tYOAwlk=",
+        "narHash": "sha256-xp62OkRkbUDNUc6VSqH02jB0FbOS+MsfMb7wL1RJOfA=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "9a9960b98418f8c385f52de3b09a63f9c561427a",
+        "rev": "9ddcaffecdf098822d944d4147dd8da30b4e6843",
         "type": "github"
       },
       "original": {
@@ -274,11 +274,11 @@
     },
     "nur": {
       "locked": {
-        "lastModified": 1715372719,
+        "lastModified": 1715871275,
-        "narHash": "sha256-Y9n5ewZH/oLUXcGhMOD2UamNbvM8UU1HYAl3VXtEcsU=",
+        "narHash": "sha256-m9GtxcnJITKZ1YF29PZ7d67PAAXDjG9r66JwCrgyMNY=",
         "owner": "nix-community",
         "repo": "NUR",
-        "rev": "65995cfffcbd9dff156f4807002201a7c913b9ef",
+        "rev": "ff15e8c091246f611200d40e265f60b381289fc6",
         "type": "github"
       },
       "original": {

hosts/framenix/default.nix

@@ -26,7 +26,7 @@ in
   systemd.services.nix-daemon.environment.TMPDIR = "/var/tmp";
 
   # try newer kernels
-  boot.kernelPackages = pkgs.linuxPackages_latest;
+  boot.kernelPackages = pkgs.linuxPackages_6_8;   # FIXME: virtualbox not yet compatible with 6.9
 
   boot.kernelParams = [
     # powersave