fix: NixOS | do not generate age key

flake.lock

@@ -444,21 +444,6 @@
         "type": "github"
       }
     },
-    "impermanence": {
-      "locked": {
-        "lastModified": 1737831083,
-        "narHash": "sha256-LJggUHbpyeDvNagTUrdhe/pRVp4pnS6wVKALS782gRI=",
-        "owner": "nix-community",
-        "repo": "impermanence",
-        "rev": "4b3e914cdf97a5b536a889e939fb2fd2b043a170",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-community",
-        "repo": "impermanence",
-        "type": "github"
-      }
-    },
     "lanzaboote": {
       "inputs": {
         "crane": "crane",
@@ -622,7 +607,6 @@
         "disko": "disko",
         "home-manager": "home-manager",
         "hyprland": "hyprland",
-        "impermanence": "impermanence",
         "lanzaboote": "lanzaboote",
         "nix-secrets": "nix-secrets",
         "nixos-hardware": "nixos-hardware",