Fix typo in LFS image
For the LFS image, we need postgresql-10
not postgresql-11
(see https://gitlab.com/gitlab-org/gitlab/-/jobs/371022654).
This is a follow-up of !244 (merged).
For the LFS image, we need postgresql-10
not postgresql-11
(see https://gitlab.com/gitlab-org/gitlab/-/jobs/371022654).
This is a follow-up of !244 (merged).