[DRE-maint] ruby-activerecord-import is marked for autoremoval from testing

[Debian testing autoremoval watch]

ruby-activerecord-import 0.28.2-3 is marked for autoremoval from testing on 2019-03-20

It (build-)depends on packages with these RC bugs:
921320: ruby-rspec-rails: ruby-rspec-rails build depends on ruby-capybara (>= 2.15~) that is currently not in buster