flake: update nix-darwin repo

Author: smoothprogrammer

flake.nix

@@ -7,7 +7,7 @@
     dt.inputs.nixpkgs.follows = "nixpkgs";
     home-manager.url = "github:nix-community/home-manager";
     home-manager.inputs.nixpkgs.follows = "nixpkgs";
-    darwin.url = "github:LnL7/nix-darwin";
+    darwin.url = "github:nix-darwin/nix-darwin";
     darwin.inputs.nixpkgs.follows = "nixpkgs";
     homini.url = "github:minizilla/homini";
     homini.inputs.nixpkgs.follows = "nixpkgs";