thanos update to 15.7.9-bb.6

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/thanos/-/blob/15.7.9-bb.6/CHANGELOG.md

Package MR

big-bang/product/packages/thanos!92 (merged)

For Issue

Closes big-bang/product/packages/thanos#69 (closed)

Upgrade Notices

N/A