Hot patch the production to fix the bitbucket authentication

CE issue: https://gitlab.com/gitlab-org/gitlab-ce/issues/39495

MR for CE change: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/15051

Applied patch: https://dev.gitlab.org/gitlab/post-deployment-patches/merge_requests/7

After applying the patch on prod I was able to successfully authenticate with newly created BB account. The staging and canary auth with bitbucket is still broken and needs to be fixed.