Update Ironbank kubectl, nginx, gels

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/grafana/grafana-enterprise-logs	minor	v1.6.0 -> v1.7.1
registry1.dso.mil/ironbank/opensource/kubernetes/kubectl	minor	v1.26.4 -> 1.27.3
registry1.dso.mil/ironbank/opensource/nginx/nginx	minor	1.23.3 -> 1.25.1

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