fix: migrate to new Darwin SDK pattern in nix flake (npm#154)

Replace removed `darwin.apple_sdk.frameworks.Security` with `apple-sdk`,
following the nixpkgs Darwin SDK migration (NixOS/nixpkgs#354146).

Co-authored-by: joshgodsiff <josh.godsiff@gmail.com>

Author: joshgodsiff

flake.nix

@@ -24,7 +24,7 @@
 
         darwinDeps = with pkgs; [
           libiconv
-          darwin.apple_sdk.frameworks.Security
+          apple-sdk
         ];
 
         gws = pkgs.rustPlatform.buildRustPackage {