Renovate: Upgrade OPA Gatekeeper Package Dependencies

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/opensource/openpolicyagent/gatekeeper	patch	v3.15.0 -> v3.15.1
registry1.dso.mil/ironbank/opensource/kubernetes/kubectl	patch	v1.28.6 -> v1.28.7

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Configuration

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Upgrade Notices

N/A