Update dependency registry1.dso.mil/ironbank/opensource/mattermost/mattermost to v9.6.0

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/opensource/mattermost/mattermost	minor	9.5.2 -> 9.6.0
common (source)	major	1.x.x -> 2.x

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Upgrade Notices

N/A

added Package Sustainment kindmaintenance mattermost labels

mentioned in issue #98 (closed)

added teamStorage & Collaboration label

assigned to @benjamin.starks

added 1 commit

• 6acc742a - update helm release version

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marked this merge request as ready

changed the description

added statusreview label

changed the description

requested review from @seanthomas007, @cwilliams68067, @kershaw.jacob, and @samvongsay

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approved this merge request

merged

mentioned in commit 2b58b844

mentioned in merge request !190 (closed)

mentioned in merge request big-bang/bigbang!4036 (merged)