mattermost update to 10.1.2-bb.0

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/mattermost/-/blob/10.1.2-bb.0/CHANGELOG.md

Package MR

big-bang/product/packages/mattermost!280 (merged)

For Issue

Closes big-bang/product/packages/mattermost#182 (closed)

Upgrade Notices

N/A