Draft: SKIP UPDATE CHECK Update Ironbank to v3.16.3

This MR contains the following updates:

Package	Update	Change
ironbank/opensource/openpolicyagent/gatekeeper (source)	patch	v3.16.2 -> v3.16.3
registry1.dso.mil/ironbank/opensource/openpolicyagent/gatekeeper (source)	patch	v3.16.2 -> v3.16.3

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