Update istio/citadel:1.5.4 Docker digest to 1a86f2e

This MR contains the following updates:

Package	Type	Update	Change
istio/citadel	ironbank-docker	digest	50d2dc0 -> 1a86f2e

---

Renovate configuration

📅 Schedule: 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.