gatekeeper update to 3.18.2-bb.4

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/policy/-/blob/3.18.2-bb.4/CHANGELOG.md

Package MR

big-bang/product/packages/policy!305 (merged)

big-bang/product/packages/policy!312 (merged)

big-bang/product/packages/policy!314 (merged)

For Issue

Closes big-bang/product/packages/policy#277 (closed)

Upgrade Notices

N/A