alloy update to 1.6.15-bb.0

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/alloy/-/blob/1.6.15-bb.0/CHANGELOG.md

Package MR

big-bang/product/packages/alloy!67 (merged)

For Issue

Closes big-bang/product/packages/alloy#63 (closed)

Upgrade Notices

N/A