Use `bin/rails` rather than `rake` for deployment tasks

Because this is the documented way of running migrations https://guides.rubyonrails.org/active_record_migrations.html#running-migrations

and this runs the migrations in the current bundle context if they are using bundler, without any extra capistrano gems required.

Start by locating the deployment tasks that invoke `rake` and compare them with the Rails migration documentation linked in the issue. Confirm the expected command in the current Bundler context, then verify that the deployment tasks use `bin/rails` and still run migrations correctly.

Written by the indexing model from the issue text.