modules/darwin/common: use nix 2.16

modules/darwin/common/default.nix

@@ -8,6 +8,10 @@ in
     ./telegraf.nix
   ];
 
+  # use the same version as srvos
+  # https://github.com/numtide/srvos/blob/main/nixos/common/nix.nix#L4
+  nix.package = pkgs.nixVersions.nix_2_16;
+
   services.nix-daemon.enable = true;
 
   programs.zsh.enable = true;