grafana update to 7.3.0-bb.0

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/grafana/-/blob/7.3.0-bb.0/CHANGELOG.md

Package MR

big-bang/product/packages/grafana!55 (merged)

For Issue

Closes big-bang/product/packages/grafana#23 (closed)

Upgrade Notices

N/A