Bump Rails to 6.0.3.1

changed milestone to %13.1

We'd want to upgrade the Gemfile in qa/ too. Though that could be in a separate MR.

Also Gitaly. I could just change gitaly!2144 (merged) to use 6.0.3.1 if this gets merged first.

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added backstage [DEPRECATED] groupconfigure [DEPRECATED] maintenancedependency labels

We may also want to upgrade the Rails related NPM packages which follow the same Rails versioning even though no changes were made. It's only @rails/actioncable for now I think.

But this could also be in another MR