Rst 1861 - Gem updates

[garytaylor]

Rails update - minor - from 5.2.2.1 to 5.2.3
Update bootsnap
Update capybara (test only)
Update carrierwave
Update cucumber-rails (test only)
Update dotenv-rails (dev only)
Update fog-aws
Update faraday
Update factory_bot_rails (test only)
Update webmock (test only)
Update simplecov (test only)
Update rubocop (develop only)
Update poltergeist (test only)
Update rpsec-rails (test only)
Update rspec-its (test only)
Update selenium-webdriver (test only)
Update sidekiq
Update sidekiq_alive
Update uk_postcode
Update slim
Update site_prism (test only)
Update simple_form