Update dependency mattermost/mattermost to v9.4.1

This MR contains the following updates:

Package	Update	Change
mattermost/mattermost	minor	9.3.0 -> 9.4.1
mattermost/mattermost	minor	v9.3.0 -> 9.4.1

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Release Notes

mattermost/mattermost (mattermost/mattermost)

v9.4.1

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Mattermost Platform Release 9.4.1 includes various new improvements and bug fixes.

v9.4.0

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Pre-release of 9.4.0.

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Configuration

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