Update Ironbank

This MR contains the following updates:

Package	Update	Change
ironbank/big-bang/grafana/grafana-plugins (source)	patch	11.2.0 -> 11.2.1
ironbank/kiwigrid/k8s-sidecar (source)	minor	1.27.6 -> 1.28.0
registry1.dso.mil/ironbank/big-bang/grafana/grafana-plugins (source)	patch	11.2.0 -> 11.2.1
registry1.dso.mil/ironbank/kiwigrid/k8s-sidecar (source)	minor	1.27.6 -> 1.28.0

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

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• Tested and Validated changes

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Upgrade Notices

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