mattermost update to 11.1.1-bb.1

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/mattermost/-/blob/11.1.1-bb.1/CHANGELOG.md

Package MR

big-bang/product/packages/mattermost!339 (merged)

For Issue

Closes big-bang/product/packages/mattermost#244 (closed)

Upgrade Notices

N/A

Linked Issue

big-bang/product/packages/mattermost#244 (closed)