grafana update to 7.3.9-bb.2

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/grafana/-/blob/7.3.9-bb.2/CHANGELOG.md

Package MR

big-bang/product/packages/grafana!105 (merged)

For Issue

Closes big-bang/product/packages/grafana#61 (closed)

Upgrade Notices

N/A