Mattermost update discontinues support for old cli
Related to the errors in https://gitlab.com/gitlab-org/gitlab-ce/issues/33080
The Old CLI was removed: https://github.com/mattermost/platform/commit/f9be4d5acbc188a5fe21e6a6f5b96c4ad2b7bf08
We need to update the version command in order to get mattermost working.
And going forward we should drop the db update code. We need to test and make sure the upgrade code still worked in 9.0, as long as it did, we are probably okay to drop it.