Update database schema for Rails 6.1
Update database schema for Rails 6.1

In ActiveRecord 6.1.0, the Default engine `ENGINE=InnoDB` is no longer
dumped to make schema more agnostic.

Running `rails db:migrate` with no new migrations to update the schema
file.

alphagov/whitehall,alphagov/whitehall,alphagov/whitehall,alphagov/whitehall