Update argoproj/argocli Docker tag to v3.6.12

This MR contains the following updates:

Package	Type	Update	Change
argoproj/argocli		patch	v3.6.11 -> v3.6.12
argoproj/argocli	ironbank-docker	patch	v3.6.11-linux-arm64 -> v3.6.12-linux-arm64
argoproj/argocli	stage	patch	v3.6.11-linux-arm64 -> v3.6.12-linux-arm64

---

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.