Update registry1.dso.mil/ironbank/opensource/kubernetes/kubectl Docker tag to v1.30.6

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/opensource/kubernetes/kubectl (source)	patch	v1.30.5 -> v1.30.6

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

added Package Sustainment kindmaintenance mattermost labels

mentioned in issue #180 (closed)

added teamStorage & Collaboration label

assigned to @pchristiel

changed the description

marked this merge request as ready

added statusreview label

approved this merge request

mentioned in commit ca969e45

merged

mentioned in merge request big-bang/bigbang!5308 (merged)