Fix deprecation warning for clear_active_connections! call

Author: mhoofman

lib/cypress-rails/manages_transactions.rb

@@ -46,7 +46,7 @@ def rollback_transaction
       end
       @connections.clear
 
-      ActiveRecord::Base.clear_active_connections!
+      ActiveRecord::Base.connection_handler.clear_active_connections!
     end
 
     private