Update Ironbank

This MR contains the following updates:

Package	Update	Change
ironbank/opensource/openpolicyagent/gatekeeper	minor	v3.11.0 -> v3.12.0
registry1.dso.mil/ironbank/opensource/kubernetes/kubectl	patch	v1.26.3 -> v1.26.4
registry1.dso.mil/ironbank/opensource/openpolicyagent/gatekeeper	minor	v3.11.0 -> v3.12.0

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