Renovate: Upgrade Gitlab Dependencies

• Sync upstream helm chart version with updated dependencies.
• Update synker file in bigbang with gitlab-exporter version.

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• SKIP UPDATE CHECK Update Ironbank to v15.5.2 (ironbank/gitlab/gitlab/gitlab-webservice, registry1.dso.mil/ironbank/gitlab/gitlab/alpine-certificates, registry1.dso.mil/ironbank/gitlab/gitlab/gitaly, registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-container-registry, registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-exporter, registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-mailroom, registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-shell, registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-sidekiq, registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-toolbox, registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-webservice, registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-workhorse, registry1.dso.mil/ironbank/gitlab/gitlab/kubectl)