Update gatekeeper

This MR contains the following updates:

Package	Update	Change
bb-common	minor	1.5.0 → 1.6.0
gluon	patch	1.1.6 → 1.1.9
registry1.dso.mil/ironbank/opensource/kubernetes/kubectl (source)	minor	v1.35 → v1.37

Complete MR checklist

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• 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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Closes #331 (closed)