Update Ironbank to 16.8.1

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/bitnami/analytics/redis-exporter	minor	v1.56.0 -> v1.57.0
registry1.dso.mil/ironbank/gitlab/gitlab/certificates	patch	16.8.0 -> 16.8.1
registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-container-registry	patch	16.8.0 -> 16.8.1
registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-pages	patch	16.8.0 -> 16.8.1
registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-workhorse	patch	16.8.0 -> 16.8.1
registry1.dso.mil/ironbank/gitlab/gitlab/kubectl	patch	16.8.0 -> 16.8.1

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