promtail update to 6.16.6-bb.0

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/promtail/-/blob/6.16.6-bb.0/CHANGELOG.md

Package MR

big-bang/product/packages/promtail!92

For Issue

Closes big-bang/product/packages/promtail#61

Upgrade Notices

Note: bumping promtail image/appVersion beyond the version used in upstream chart (v3.0.0 vs v3.3.2)