Update Ironbank

This MR contains the following updates:

Package	Update	Change
ironbank/opensource/nginx/nginx (source)	patch	1.26.1 -> 1.26.2
registry1.dso.mil/ironbank/opensource/kubernetes/kubectl (source)	patch	v1.29.7 -> v1.29.8

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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