Atualização do Docker para a versão mais recente

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Manually update Discourse and Docker image to latest

This guide provides step-by-step instructions for manually updating Discourse, the Docker container, and the Ubuntu operating system on a self-hosted setup. Required user level: System Administrator SSH access to the server. If you self-host Discourse, you occasionally need to run a manual update via the command line to get the latest security releases newest libraries. These updates are not picked up in admin/update, which is why you’ll occasiona…