Update dependency mattermost/mattermost to v9.11.1

This MR contains the following updates:

Package	Update	Change
mattermost/mattermost	patch	9.11.0 -> 9.11.1

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Release Notes

mattermost/mattermost (mattermost/mattermost)

v9.11.1

Compare Source

Mattermost Platform Extended Support Release 9.11.1 contains low to medium severity level security fixes.

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Configuration

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