Update Ironbank to v15.2.1 DEBUG

This MR contains the following updates:

Package	Update	Change
ironbank/gitlab/gitlab-runner/gitlab-runner	minor	v15.0.0 -> v15.2.1
registry1.dso.mil/ironbank/gitlab/gitlab-runner/gitlab-runner-helper	minor	v15.0.0 -> v15.2.1

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This MR has been generated by Renovate Bot.

related https://repo1.dso.mil/platform-one/big-bang/apps/developer-tools/gitlab-runner/-/issues/38