nixos/cnping: fix setcap wrapper (#394915)

nixos/modules/programs/cnping.nix

···
 
   config = lib.mkIf cfg.enable {
     security.wrappers.cnping = {
+      owner = "root";
+      group = "root";
       source = "${pkgs.cnping}/bin/cnping";
       capabilities = "cap_net_raw+ep";
     };