[openstreetmap/openstreetmap-website] Update to rails 6.1 (#3193)

[Andy Allan]

> > Is the Docker build failure expected?
> 
> I've found the docker tests to be both slow and flaky, ever since it was introduced. I must say that I'm in the bad habit of ignoring the failures already.

I should expand on that and say that most times I see it happen, I rerun the tests and it passes. So for my own PRs I do this (some times a couple of times) so that we get green lights across the board, and to save anyone else from diving into it or to remove any reluctance to merge. But when I see that everything is green and the docker test is red, I pretty much assume it's a false alarm.

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