Automate updating project templates

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I created a new project using the Ruby on Rails project template. The latest Rails version currently is 6.0.2.1, but my new project came with version 5.2.0. I would expect to have the latest version when starting a new project, but what's worse is that 5.2.0 have known security vulnerabilities. 🙀

Project templates need to be kept up-to-date. Updating them manually one by one and checking its dependencies is not feasible. We need to find a way to automatically update dependencies and all of our existing project templates.