flake: update eachSystem to use lib.systems.flakeExposed

flake.lock

@@ -3234,7 +3234,6 @@
         "nvf": "nvf",
         "plasma-manager": "plasma-manager",
         "portfolio": "portfolio",
-        "systems": "systems_7",
         "treefmt-nix": "treefmt-nix"
       }
     },
@@ -3391,21 +3390,6 @@
         "type": "github"
       }
     },
-    "systems_7": {
-      "locked": {
-        "lastModified": 1689347949,
-        "narHash": "sha256-12tWmuL2zgBgZkdoB6qXZsgJEH9LR3oUgpaQq2RbI80=",
-        "owner": "nix-systems",
-        "repo": "default-linux",
-        "rev": "31732fcf5e8fea42e59c2488ad31a0e651500f68",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default-linux",
-        "type": "github"
-      }
-    },
     "treefmt-nix": {
       "inputs": {
         "nixpkgs": "nixpkgs_9"

flake.nix

@@ -4,13 +4,12 @@
   outputs = {
     self,
     nixpkgs,
-    systems,
     agenix,
     deploy-rs,
     treefmt-nix,
     ...
   } @ inputs: let
-    eachSystem = f: nixpkgs.lib.genAttrs (import systems) (system: f nixpkgs.legacyPackages.${system});
+    eachSystem = f: nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed (system: f nixpkgs.legacyPackages.${system});
     treefmtEval = eachSystem (pkgs: treefmt-nix.lib.evalModule pkgs ./treefmt.nix);
   in {
     devShells = eachSystem (pkgs: {
@@ -32,7 +31,6 @@
   inputs = {
     # nix related
     nixpkgs.url = "nixpkgs/nixos-unstable";
-    systems.url = "github:nix-systems/default-linux";
     nixos-hardware.url = "github:NixOS/nixos-hardware";
     lanzaboote = {
       url = "github:nix-community/lanzaboote/v0.4.1";