Update registry1.dso.mil/ironbank/opensource/grafana/grafana Docker tag to v10.2.3

This MR contains the following updates:

Package	Type	Update	Change
registry1.dso.mil/ironbank/opensource/grafana/grafana		patch	10.2.2 -> 10.2.3
registry1.dso.mil/ironbank/opensource/grafana/grafana	ironbank-base	patch	10.2.2 -> 10.2.3
registry1.dso.mil/ironbank/opensource/grafana/grafana	final	patch	10.2.2 -> 10.2.3

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