Update Ironbank

This MR contains the following updates:

Package	Update	Change
ghcr.io/renovatebot/renovate (source)	major	38.142.0 -> 39.7.1
gluon	patch	0.5.8 -> 0.5.9
registry1.dso.mil/ironbank/container-hardening-tools/renovate/renovate (source)	major	38.139.1 -> 39.4.0

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

N/A

Closes #49 (closed)