Update istio/install-cni Docker tag to v1.18.2

This MR contains the following updates:

Package	Type	Update	Change
istio/install-cni	ironbank-docker	patch	1.18.1-distroless -> 1.18.2-distroless
istio/install-cni		patch	1.18.1 -> 1.18.2
istio/install-cni	stage	patch	1.18.1-distroless -> 1.18.2-distroless

---

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 these updates again.

---

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

---

This MR has been generated by Renovate Bot.