Update docker Docker tag

This MR contains the following updates:

Package	Type	Update	Change
docker	service-image	patch	19.03.4-dind -> 19.03.5-dind
docker	service-image	patch	19.03.6-dind -> 19.03.8-dind

---

Renovate configuration

📅 Schedule: At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever MR becomes conflicted.

👻 Immortal: This MR will be recreated if closed unmerged. Get config help if that's undesired.

---

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

---

Available now for GitLab: Renovate Pro with real-time webhook handling and priority job queue.