Update quay.io/skupper/service-controller Docker tag to v1.6.0

This MR contains the following updates:

Package	Type	Update	Change
quay.io/skupper/service-controller		minor	1.5.3 -> 1.6.0
quay.io/skupper/service-controller	ironbank-docker	minor	1.5.3 -> 1.6.0
quay.io/skupper/service-controller	stage	minor	1.5.3 -> 1.6.0

---

Configuration

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

🚦 Automerge: Enabled.

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

🔕 Ignore: Close this MR and you won't be reminded about these updates again.

---

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

---

This MR has been generated by Renovate Bot.