thanos update to 15.7.9-bb.4

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/thanos/-/blob/15.7.9-bb.4/CHANGELOG.md

Package MR

big-bang/product/packages/thanos!86 (merged)

For Issue

Closes #2098 (closed)

Upgrade Notices

N/A