grafana update to 7.3.0-bb.1

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/grafana/-/blob/7.3.0-bb.1/CHANGELOG.md

Package MR

big-bang/product/packages/grafana!58 (merged)

For Issue

Closes big-bang/product/packages/grafana#21 (closed)

Upgrade Notices

N/A