Update velero to v1.12.0, kubectl to 1.27.3

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/opensource/kubernetes/kubectl	minor	1.27.6 -> v1.28.2
registry1.dso.mil/ironbank/opensource/velero/velero	minor	v1.11.1 -> v1.12.0
registry1.dso.mil/ironbank/opensource/velero/velero	minor	1.11.1 -> 1.12.0
registry1.dso.mil/ironbank/opensource/velero/velero-plugin-for-aws	minor	v1.7.1 -> v1.8.0
registry1.dso.mil/ironbank/opensource/velero/velero-plugin-for-csi	minor	v0.5.1 -> v0.6.0
registry1.dso.mil/ironbank/opensource/velero/velero-plugin-for-microsoft-azure	minor	v1.7.1 -> v1.8.0
velero/velero-plugin-for-aws	minor	v1.7.1 -> v1.8.0
velero/velero-plugin-for-csi	minor	v0.5.1 -> v0.6.0
velero/velero-restore-helper	minor	v1.11.1 -> v1.12.0

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