Update Ironbank to v3.51.0

This MR contains the following updates:

Package	Update	Change
ironbank/sonatype/nexus/nexus	minor	3.47.1-01 -> 3.51.0-01
registry1.dso.mil/ironbank/sonatype/nexus/nexus	minor	3.47.1-01 -> 3.51.0-01

---

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.

🔕 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.