Update gatekeeper to v3.13.3, kubectl to v1.28.3, gluon to 0.4.3

This MR contains the following updates:

Package	Update	Change
gluon	patch	0.4.1 -> 0.4.3
ironbank/opensource/openpolicyagent/gatekeeper	patch	v3.13.2 -> v3.13.3
registry1.dso.mil/ironbank/opensource/kubernetes/kubectl	patch	v1.28.2 -> v1.28.3
registry1.dso.mil/ironbank/opensource/openpolicyagent/gatekeeper	patch	v3.13.2 -> v3.13.3

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This MR has been generated by Renovate Bot.