Update Ironbank

This MR contains the following updates:

Package	Update	Change
ironbank/opensource/grafana/loki	minor	2.6.1 -> 2.7.0
registry1.dso.mil/ironbank/grafana/grafana-enterprise-logs	minor	v1.5.2 -> v1.6.0
registry1.dso.mil/ironbank/opensource/grafana/loki	minor	2.6.1 -> 2.7.0

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