Draft: Update Ironbank to v2

This MR contains the following updates:

Package	Update	Change
ironbank/big-bang/base	major	1.18.0 -> 2.0.0
registry1.dso.mil/ironbank/big-bang/base	major	1.18.0 -> 2.0.0

---

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 these updates again.

---

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

---

This MR has been generated by Renovate Bot.