loki update to 6.12.0-bb.6

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/loki/-/blob/6.12.0-bb.6/CHANGELOG.md

Package MR

big-bang/product/packages/loki!281 (merged)

For Issue

Closes big-bang/product/packages/loki#202 (closed)

Upgrade Notices

N/A