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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