chore(deps): update ironbank to v1.20.0

This MR contains the following updates:

Package	Update	Change
ironbank/hashicorp/vault (source)	minor	1.19.5 -> 1.20.0
registry1.dso.mil/ironbank/hashicorp/vault (source)	minor	1.19.5 -> 1.20.0

Complete MR checklist

Assignee

• Followed upgrade instructions outlined in docs/DEVELOPMENT_MAINTENANCE.md
• Update Docs with new/updated steps as needed
• Tested and Validated Changes made with supporting info like logs or screenshots from test pipelines

Add supporting info below

chuka@DESKTOP-006TSPC:~/bigbang/bigbang$ kubectl get pods -n vault
NAME                                          READY   STATUS      RESTARTS   AGE
vault-vault-0                                 2/2     Running     0          23m
vault-vault-agent-injector-6f8b47b99d-hbw7x   2/2     Running     0          23m
vault-vault-job-init-gnh98                    0/3     Completed   0          23m

Reviewer only

• Tested and Validated changes

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Upgrade Notices

N/A