Update dependency registry1.dso.mil/ironbank/opensource/mattermost/mattermost to v9.4.1

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/opensource/mattermost/mattermost	minor	v9.3.0 -> 9.4.2
registry1.dso.mil/ironbank/opensource/mattermost/mattermost	minor	9.3.0 -> 9.4.2

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