Updated nexus git tag

Package Merge Request

Package Changes

https://repo1.dso.mil/platform-one/big-bang/apps/developer-tools/nexus/-/blob/42.0.0-bb.4/CHANGELOG.md

Package MR

https://repo1.dso.mil/platform-one/big-bang/apps/developer-tools/nexus/-/merge_requests/75

For Issue

Closes https://repo1.dso.mil/platform-one/big-bang/apps/developer-tools/nexus/-/issues/49