Update GitLab Mattermost docs for Mattermost 6.2.1
What does this MR do and why?
This is to update the GitLab Omnibus/Mattermost version table for Mattermost 6.2.1 once omnibus-gitlab!5828 (merged) gets merged
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Harrison Healey