When calling `save!` without changing any attributes then Rails doesn't
always touch other records because nothing changed. So I changed the
spec to `touch` explicitely and it turns out that everything passes.
Tada, our code seems correct and it was only the spec which seemed
broken in Rails 7.
I didn't observe it but if the spec code would run within the same
millisecond then we wouldn't be able to observe a change to
`updated_at`. Time travel solves this potential problem.
I found this because Rails 7 converts timestamps to database precision
straight away. While we may have some broken logic in the code, most of
these cases may just be broken spec code. Watch this space.
