Update capybara when deprecations are fixed

[RandomTannenbaum]

The current Capybara Version calls the deprecated clear_local_storage and clear_session_storage functions. This produces a lot of deprecation warnings, which clutter our test log. Currently we just suppress these warnings (see capybara.rb). As commented in the ticket below they will look at it soon. When the deprecated calls are removed we should be able to remove the suppression.

teamcapybara/capybara#2779

ToDo

• Update Capybara when the deprecated calls are removed
• Remove the line that suppresses the deprecation warnings