Update nixpkgs lock and disable Librewolf

Bump nixpkgs to the latest revision and set librewolf.enable to false
in both the Desktop and Laptop home module configurations.

flake.lock

@@ -456,11 +456,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1781074563,
-        "narHash": "sha256-md8WlXOlfnIeHeOScMTTHFyf2d6iaTwPl2apR5EQ3P4=",
+        "lastModified": 1781577229,
+        "narHash": "sha256-lrp67w8AulE9Ks53n27I45ADSzbOCn4H+CNW1Ck8B+8=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "9ae611a455b90cf061d8f332b977e387bda8e1ca",
+        "rev": "567a49d1913ce81ac6e9582e3553dd90a955875f",
         "type": "github"
       },
       "original": {