Until now, Rails only droped compatibility with older
rubies on new majors, but I propose to change this policy
because it causes us to either keep compatibility with long
EOLed rubies or to bump the Rails major more often, and to
drop multiple Ruby versions at once when we bump the major.
In my opinion it's a bad alignments of incentives. And we'd
be much better to just drop support in new minors whenever they
go EOL (so 3 years).
Also Ruby being an upstream dependency, it's not even
a semver violation AFAICT.
Since Rails 7.2 isn't planned before a few months, we
can already drop Ruby 3.0 as it will be EOL in March.
One of the original goals of these checks was to validate that
configuration stays in alphabetical order, as this provides a
deterministic order for the configuration to be validated against.
However, it appears there has been a regression in that check and it has
only been validating that configurations are present. This commit
restores the ordering check and then uses `railspect configuration . -a`
to fix the configurations that ended up out of order.
