Update dependency registry1.dso.mil/ironbank/opensource/kubernetes/kubectl to v1.26.4

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/opensource/kubernetes/kubectl	patch	v1.26.3 -> v1.26.4

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mentioned in issue #38 (closed)

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assigned to @chris.hayter

marked this merge request as ready

requested review from @rob.ferguson, @brandt.w.keller, and @echuang

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merged

mentioned in commit 33f2c5de

mentioned in merge request big-bang/bigbang!2722 (merged)