certigo: disable test on Darwin-x86_64 (#172790)

Partially reverts #167546.

Hydra Darwin x86_64 tests have been failing since merge
https://hydra.nixos.org/job/nixpkgs/trunk/certigo.x86_64-darwin

ZHF: #172160

pkgs/tools/admin/certigo/default.nix

@@ -1,4 +1,4 @@
-{ lib, buildGoModule, fetchFromGitHub }:
+{ lib, stdenv, buildGoModule, fetchFromGitHub }:
 
 buildGoModule rec {
   pname = "certigo";
@@ -13,6 +13,11 @@ buildGoModule rec {
 
   vendorSha256 = "sha256-qS/tIi6umSuQcl43SI4LyL0k5eWfRWs7kVybRPGKcbs=";
 
+  # Go running under Hydra Darwin x86_64 picks CHAPOLY instead of AES-GCM as
+  # the default TLS ciphersuite, and breaks the arguably flakey `TestConnect`
+  # test.
+  doCheck = !(stdenv.isDarwin && stdenv.isx86_64);
+
   meta = with lib; {
     description = "A utility to examine and validate certificates in a variety of formats";
     homepage = "https://github.com/square/certigo";