Draft: Update Ironbank

This MR contains the following updates:

Package	Update	Change
docker.io/nginxinc/nginx-unprivileged	minor	1.19-alpine -> 1.21-alpine
ironbank/opensource/nginx/nginx	patch	1.21.5 -> 1.21.6
registry1.dso.mil/ironbank/grafana/grafana-enterprise-logs	minor	v1.2.0 -> 1.3.0
registry1.dso.mil/ironbank/opensource/grafana/loki	patch	2.4.1 -> 2.4.2
registry1.dso.mil/ironbank/opensource/nginx/nginx	patch	1.21.5 -> 1.21.6

---

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.

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

---

• If you want to rebase/retry this MR, click this checkbox.

---

This MR has been generated by Renovate Bot.