Reuse systems input for flake-utils (#25)

* Reuse systems input for flake-utils

This change should make `flake-utils` use the same `systems` input as root. This prevents a duplicate input `systems_2` from appearing in `flake.lock`.

* Run nix flake update flake-utils

flake.lock

@@ -2,7 +2,9 @@
   "nodes": {
     "flake-utils": {
       "inputs": {
-        "systems": "systems"
+        "systems": [
+          "systems"
+        ]
       },
       "locked": {
         "lastModified": 1731533236,
@@ -38,7 +40,7 @@
       "inputs": {
         "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs",
-        "systems": "systems_2"
+        "systems": "systems"
       }
     },
     "systems": {
@@ -55,21 +57,6 @@
         "repo": "default",
         "type": "github"
       }
-    },
-    "systems_2": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
     }
   },
   "root": "root",

flake.nix

@@ -2,6 +2,7 @@
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
     flake-utils.url = "github:numtide/flake-utils";
+    flake-utils.inputs.systems.follows = "systems";
     systems.url = "github:nix-systems/default";
   };