Draft: Update Ironbank

This MR contains the following updates:

Package	Update	Change
ironbank/kiwigrid/k8s-sidecar (source)	patch	1.28.0 -> 1.28.4
registry1.dso.mil/ironbank/kiwigrid/k8s-sidecar (source)	patch	1.28.0 -> 1.28.4
registry1.dso.mil/ironbank/opensource/bats/bats (source)	patch	v1.11.0 -> 1.11.1

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

Reviewer only

• Tested and Validated changes

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Upgrade Notices

(Include any relevant notes about upgrades here or write "N/A" if there are none)