mattermost update to 7.9.1-bb.0

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/mattermost/-/blob/7.9.1-bb.0/CHANGELOG.md

Package MR

big-bang/product/packages/mattermost!115 (merged)

For Issue

Closes big-bang/product/packages/mattermost#65 (closed)

added botmr mattermost statusreview labels

assigned to @michael.kruggel

changed the description

requested review from @micah.nagel, @ryan.j.garcia, and @rob.ferguson

changed the description

marked this merge request as ready

changed milestone to %2.0.0

approved this merge request

merged

mentioned in commit 5fabf017