Update Grafana to 7.3.7

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/big-bang/grafana/grafana-plugins (source)	minor	10.3.3 -> 10.4.0
registry1.dso.mil/ironbank/kiwigrid/k8s-sidecar (source)	minor	1.25.4 -> 1.26.1

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Upgrade Notices

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