grafana update to 7.3.7-bb.3

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/grafana/-/blob/7.3.7-bb.3/CHANGELOG.md

Package MR

big-bang/product/packages/grafana!87 (merged)

For Issue

Relates #1990 (closed)

Upgrade Notices

n/a