This option was deprecated in Rails 7.0 and removed in Rails 7.1 [1]. It
doesn't really affect us because we weren't using `to_s` with a
parameter anywhere in the application.
The Rubocop rule Rails/ToSWithArgument can be used to detect these cases
but, since we've never used them, and adding them now would cause the
application to crash and so it'll be obvious we've done something wrong,
I don't think it's necessary to add the rule.
[1] https://github.com/rails/rails/commit/e420c3380
726d8a8935