gitlab: 12.3.5 -> 12.4.0

- gitlab-shell no longer requires ruby for anything else than the
  install script, so the bundlerEnv stuff could be dropped

- gitlab-shell and gitlab-workhorse now report their versions
  correctly

pkgs/applications/version-management/gitlab/remove-hardcoded-locations.patch

@@ -150,3 +150,14 @@ index b276a81eac..070e3ebd81 100644
        end
      end
    end
+--- a/lib/gitlab/authorized_keys.rb
++++ b/lib/gitlab/authorized_keys.rb
+@@ -157,7 +157,7 @@
+         raise KeyError, "Invalid ID: #{id.inspect}"
+       end
+ 
+-      "#{File.join(Gitlab.config.gitlab_shell.path, 'bin', 'gitlab-shell')} #{id}"
++      "#{File.join('/run/current-system/sw/bin', 'gitlab-shell')} #{id}"
+     end
+ 
+     def strip(key)