build: update flake lock

flake.lock

@@ -4,7 +4,9 @@
       "inputs": {
         "darwin": "darwin",
         "home-manager": "home-manager",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": [
+          "nixpkgs"
+        ]
       },
       "locked": {
         "lastModified": 1696775529,
@@ -79,22 +81,6 @@
       }
     },
     "nixpkgs": {
-      "locked": {
-        "lastModified": 1677676435,
-        "narHash": "sha256-6FxdcmQr5JeZqsQvfinIMr0XcTyTuR7EXX0H3ANShpQ=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "a08d6979dd7c82c4cef0dcc6ac45ab16051c1169",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixos-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs_2": {
       "locked": {
         "lastModified": 1693985761,
         "narHash": "sha256-K5b+7j7Tt3+AqbWkcw+wMeqOAWyCD1MH26FPZyWXpdo=",
@@ -114,7 +100,7 @@
       "inputs": {
         "agenix": "agenix",
         "impermanence": "impermanence",
-        "nixpkgs": "nixpkgs_2"
+        "nixpkgs": "nixpkgs"
       }
     }
   },