Update to sidekiq 6.0

spec/rails_helper.rb

@@ -15,7 +15,7 @@ ActiveRecord::Migration.maintain_test_schema!
 WebMock.disable_net_connect!
 Redis.current = Redis::Namespace.new("gabsocial_test#{ENV['TEST_ENV_NUMBER']}", redis: Redis.current)
 Sidekiq::Testing.inline!
-Sidekiq::Logging.logger = nil
+Sidekiq.logger = nil
 
 Devise::Test::ControllerHelpers.module_eval do
   alias_method :original_sign_in, :sign_in