Revert "gh: enable tests"

This reverts commit c7deb49058baaeeba60065e62487476a7f35724c.

Fails with sandboxing.

pkgs/applications/version-management/git-and-tools/gh/default.nix

@@ -1,9 +1,4 @@
-{ lib
-, fetchFromGitHub
-, buildGoModule
-, installShellFiles
-, git
-}:
+{ lib, fetchFromGitHub, buildGoModule, installShellFiles }:
 
 buildGoModule rec {
   pname = "gh";
@@ -35,10 +30,8 @@ buildGoModule rec {
     done
   '';
 
-  checkInputs = [ git ];
-  checkPhase = ''
-    make test
-  '';
+  # fails with `unable to find git executable in PATH`
+  doCheck = false;
 
   meta = with lib; {
     description = "GitHub CLI tool";