Bump gitlab-workhorse version to 8.27.0

It includes this change https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/475

Related to https://gitlab.com/gitlab-com/gl-infra/infrastructure/issues/6829 and
https://gitlab.com/gitlab-com/gl-infra/scalability/-/issues/4

GITLAB_WORKHORSE_VERSION

-8.26.0
+8.27.0