loki update to 6.6.2-bb.2

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/loki/-/blob/6.6.2-bb.2/CHANGELOG.md

Package MR

big-bang/product/packages/loki!216 (merged)

For Issue

Closes big-bang/product/packages/loki#156 (closed)

Upgrade Notices

Ensure that .Values.schemaConfig.configs v13 schema from date is at a point in time in the future.