Did you know that Automatic Updates are in the works for Drupal 9/10 as a contributed module?
The module applies patch-level updates to Drupal core in a separate, sandboxed copy of your site, to keep you up and running until the update is completely ready to be deployed. It can detect and report problems at every stage of the update process, so you don't have to find out about them after an update is live. It automatically detects database updates in an incoming update, and helps you run them during the process.
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