Update Mattermost to 5.31.1
What does this MR do?
The changelog for Mattermost 5.31 is here. There's nothing particularly notable in this release that might affect GitLab, although there are the start of some changes for some bigger features coming in the next while. It does contain a low severity security fix though.
Checklist
Required
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Merge Request Title, and Description are up to date, accurate, and descriptive -
MR targeting the appropriate branch -
MR has a green pipeline on GitLab.com -
Pipeline is green on dev.gitlab.org if the change is touching anything besides documentation or internal cookbooks -
trigger-package
has a green pipeline running against latest commit
Expected (please provide an explanation if not completing)
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Test plan indicating conditions for success has been posted and passes -
Documentation created/updated -
Tests added -
Integration tests added to GitLab QA -
Equivalent MR/issue for the GitLab Chart opened