vault update to 0.28.1-bb.6

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/vault/-/blob/0.28.1-bb.6/CHANGELOG.md

Package MR

big-bang/product/packages/vault!199 (merged)

For Issue

Closes big-bang/product/packages/vault#96 (closed)

Upgrade Notices

N/A