Fix linker error on macos 14.3 with nix build — heartwood

Using nix build resulted in a linker error

ld: framework not found Security

Following the proposed solution in https://discourse.nixos.org/t/compile-a-rust-binary-on-macos-dbcrossbar/8612 resolves the issue.

           ++ lib.optionals pkgs.stdenv.isDarwin [
             # Additional darwin specific inputs can be set here
             pkgs.libiconv
             pkgs.darwin.apple_sdk.frameworks.Security
           ];
       };