mattermost update to 10.4.2-bb.1

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/mattermost/-/blob/10.4.2-bb.1/CHANGELOG.md

Package MR

big-bang/product/packages/mattermost!293 (merged)

For Issue

Closes big-bang/product/packages/mattermost#195 (closed)

Upgrade Notices

N/A