mattermost update to 9.7.3-bb.2

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/mattermost/-/blob/9.7.3-bb.2/CHANGELOG.md

Package MR

big-bang/product/packages/mattermost!193 (merged)

For Issue

Closes big-bang/product/packages/mattermost#109 (closed)

Upgrade Notices

N/A

added botmr mattermost statusreview labels

assigned to @christianbakerm

changed the description

requested review from @chris.oconnell and @michaelmartin

changed milestone to %2.28.0

marked this merge request as ready

changed the description

added jaeger label

approved this merge request

merged

mentioned in commit 8d85cf73

mentioned in merge request big-bang/customers/template!82 (merged)

unassigned @christianbakerm