Update dependency registry1.dso.mil/ironbank/opensource/grafana/grafana to v8.6.2

This MR contains the following updates:

Package	Type	Update	Change
registry1.dso.mil/ironbank/opensource/grafana/grafana	ironbank-base	minor	8.5.5 -> 8.6.2
registry1.dso.mil/ironbank/opensource/grafana/grafana		minor	8.5.5 -> 8.6.2

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