Update Mattermost to 3.7.3 for GitLab 9.0.1

Jason Blais requested to merge jasonblais/omnibus-gitlab:patch-3 into master

Mattermost 3.7.3 available now from https://www.mattermost.com/download/

This dot release addresses a security issue that affects all previous versions, and includes a bug fix with telemetry data collection. Upgrading to Mattermost 3.7.3 is highly recommended.

You can visit https://gitlab.mattermost.com to verify and test the release. Full release notes can be found here. No changes are required for gitlab.rb.

Please let me know if you have any questions. Thanks!

Edited by GitLab Release Tools Bot

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