Update registry1.dso.mil/ironbank/opensource/kubernetes/kubectl Docker tag to v1.31.7

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/opensource/kubernetes/kubectl (source)	minor	v1.30.9 -> v1.31.7

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• Followed upgrade instructions outlined in docs/DEVELOPMENT_MAINTENANCE.md
• Update Docs with new/updated steps as needed
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