Adds sidekiq config to define logger level as WARN (#275)

Author: mattfeg

spec/spec_helper.rb

@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require "sidekiq"
+
 # This file was generated by the `rails generate rspec:install` command. Conventionally, all
 # specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`.
 # The generated `.rspec` file contains `--require spec_helper` which will cause
@@ -91,4 +93,6 @@
   #   # test failures related to randomization by passing the same `--seed` value
   #   # as the one that triggered the failure.
   #   Kernel.srand config.seed
+
+  Sidekiq.default_configuration.logger.level = Logger::WARN
 end