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/data.json

@@ -1,13 +1,13 @@
 {
-  "version": "12.3.5",
-  "repo_hash": "12ywspgnbwm232vmzbqhkqmwmcrb9pvihsayzmw0cxvhlfwq6995",
+  "version": "12.4.0",
+  "repo_hash": "0z2jykjv9sa4akq2qd4bl5ngqk3gpy2xfhxmcbd4d61w6l2jw00f",
   "owner": "gitlab-org",
   "repo": "gitlab",
-  "rev": "v12.3.5-ee",
+  "rev": "v12.4.0-ee",
   "passthru": {
-    "GITALY_SERVER_VERSION": "1.65.1",
-    "GITLAB_PAGES_VERSION": "1.9.0",
-    "GITLAB_SHELL_VERSION": "10.0.0",
-    "GITLAB_WORKHORSE_VERSION": "8.10.0"
+    "GITALY_SERVER_VERSION": "1.67.0",
+    "GITLAB_PAGES_VERSION": "1.11.0",
+    "GITLAB_SHELL_VERSION": "10.2.0",
+    "GITLAB_WORKHORSE_VERSION": "8.14.0"
   }
 }