Update registry1.dso.mil/ironbank/opensource/mattermost/mattermost Docker tag to v9.8.1

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/opensource/mattermost/mattermost (source)	patch	9.8.0 -> 9.8.1

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Upgrade Notices

N/A

added Package Sustainment kindmaintenance mattermost labels

mentioned in issue #127 (closed)

added teamStorage & Collaboration label

assigned to @akesterson

marked this merge request as ready

changed milestone to %2.29.0

added statusreview label

requested review from @dchen, @michaelmartin, @chris.oconnell, @kershaw.jacob, @samvongsay, and @benjamin.starks

changed the description

approved this merge request

mentioned in commit b6f31d4a

merged

mentioned in merge request big-bang/bigbang!4462 (merged)