promtail update to 6.15.5-bb.2

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/promtail/-/blob/6.15.5-bb.2/CHANGELOG.md

Package MR

big-bang/product/packages/promtail!69 (merged)

For Issue

For big-bang/pipeline-templates/pipeline-templates#313 (closed)

Upgrade Notices

N/A