[openstreetmap/openstreetmap-website] Update to rails 7.2.0 (PR #5070)

[Andy Allan]

I think it's a shame that we have to drop 22.04 support, since I expect some developers won't have yet upgraded their Ubuntu to 24.04. (I haven't, but I used rbenv - we don't want to rely on that for new developers). 

It seems like an unfortunate combination of release dates and support periods:
* ruby 3.0 was released in Dec 2020
* ruby 3.1 was released in Dec 2021, which was in time for Ubuntu 22.04 but wasn't the chosen version
* ruby 3.0 support ceased in Apr 2024
* rails drops 3.0 support (and therefore Ubuntu 22.04 support) in Aug 2024

So we end up with a period of only 4 months where we have two versions of Ubuntu available. We'll face a similar problem in two year's time, because Ubuntu 24.04 shipped with ruby 3.2, which will be EOL in Mar 2026 i.e. just before Ubuntu 26.04 LTS. I wish either ruby would extend their support a little, or Ubuntu would use the newest ruby, or rails would be more tolerant of slightly EOL rubies, all the make this developer experience a bit smoother.

Nevertheless, I'm happy to move forward. I would say that we should:

* Drop 22.04 from the testing matrix. If we can't run on real Ubuntu 22.04, there's little point in testing on Github Flavoured Ubuntu
* Adjust the Vagrantfile to use `ubuntu/noble64` or `generic/ubuntu2404` as appropriate
* There's a failure in building the docker image in CI

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