Update gitlab/gitlab-ce Docker tag to v16.7.3

This MR contains the following updates:

Package	Update	Change
gitlab/gitlab-ce (changelog)	patch	16.7.2-ce.0 -> 16.7.3-ce.0

---

Configuration

Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

Automerge: Disabled by config. Please merge this manually once you are satisfied.

Rebasing: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox.

Ignore: Close this MR and you won't be reminded about this update again.

---

• If you want to rebase/retry this MR, check this box

---

This MR has been generated by Renovate Bot.

mentioned in issue #40

merged

mentioned in commit ccb77873