Update registry1.dso.mil/ironbank/redhat/ubi/ubi8 Docker tag to v8.8

This MR contains the following updates:

Package	Type	Update	Change
registry1.dso.mil/ironbank/redhat/ubi/ubi8	ironbank-base	minor	8.7 -> 8.8
registry1.dso.mil/ironbank/redhat/ubi/ubi8	stage	minor	8.7 -> 8.8

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