Update Ironbank Docker tags

This MR contains the following updates:

Package	Update	Change
ironbank/big-bang/argocd	minor	v2.0.1 -> v2.1.7
ironbank/opensource/dexidp/dex	minor	v2.28.1 -> v2.30.0
ironbank/opensource/redis/redis6	patch	6.2.4 -> 6.2.6

---

Configuration

Schedule: At any time (no schedule defined).

Automerge: Disabled by config. Please merge this manually once you are satisfied.

Rebasing: Renovate will not automatically rebase this PR, because other commits have been found.

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

---

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

---

This MR has been generated by Renovate Bot.