Draft: Update Ironbank

This MR contains the following updates:

Package	Update	Change
ghcr.io/renovatebot/renovate (source)	minor	39.19.1 -> 39.26.1
registry1.dso.mil/ironbank/container-hardening-tools/renovate/renovate (source)	minor	39.15.4 -> 39.23.1

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

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