Bump github.com/mattermost/mattermost-server/v5 from 5.18.0 to 5.39.0#2

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dependabot/go_modules/github.com/mattermost/mattermost-server/v5-5.39.0larkox/mattermost-plugin-mattermud:dependabot/go_modules/github.com/mattermost/mattermost-server/v5-5.39.0Copy head branch name to clipboard