mattermost update to 9.5.1-bb.0

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/mattermost/-/blob/9.5.1-bb.0/CHANGELOG.md

Package MR

big-bang/product/packages/mattermost!184 (merged)

For Issue

Closes (link to issue here)

Upgrade Notices

N/A

added botmr mattermost statusreview labels

assigned to @benjamin.starks

restored source branch update-mattermost-tag-9.5.1-bb.0

changed the description

requested review from @ryan.j.garcia, @chris.oconnell, and @michaelmartin

approved this merge request

marked this merge request as ready

changed milestone to %2.21.0

merged

mentioned in commit 2ab55a47

mentioned in commit 368500d9

mentioned in merge request big-bang/customers/template!72 (merged)