Draft: SKIP UPDATE CHECK Update Ironbank Docker tags to v15.11.2

This MR contains the following updates:

Package	Update	Change
ironbank/gitlab/gitlab/gitlab-webservice	minor	15.10.2 -> 15.11.2
registry1.dso.mil/ironbank/gitlab/gitlab/certificates	minor	15.10.2 -> 15.11.2
registry1.dso.mil/ironbank/gitlab/gitlab/gitaly	minor	15.10.2 -> 15.11.2
registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-container-registry	minor	15.10.2 -> 15.11.2
registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-exporter	minor	15.10.2 -> 15.11.2
registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-mailroom	minor	15.10.2 -> 15.11.2
registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-shell	minor	15.10.2 -> 15.11.2
registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-sidekiq	minor	15.10.2 -> 15.11.2
registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-toolbox	minor	15.10.2 -> 15.11.2
registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-webservice	minor	15.10.2 -> 15.11.2
registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-workhorse	minor	15.10.2 -> 15.11.2
registry1.dso.mil/ironbank/gitlab/gitlab/kubectl	minor	15.10.2 -> 15.11.2

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This MR has been generated by Renovate Bot.