Prepare for upcoming Sidekiq Configuration design

Reference commit: 67daa7a408

While the docs[1] suggests to use Sidekiq::Config, but it is not
available yet. So uses Sidekiq instead to make activejob integration
tests work.

[1]https://github.com/mperham/sidekiq/blob/main/docs/global_to_local.md#explicit-configuration

activejob/test/support/integration/adapters/sidekiq.rb

@@ -53,10 +53,12 @@ module SidekiqJobsManager
 
       require "sidekiq/cli"
       require "sidekiq/launcher"
-      sidekiq = Sidekiq::Launcher.new(queues: ["integration_tests"],
-                                       environment: "test",
-                                       concurrency: 1,
-                                       timeout: 1)
+      config = Sidekiq
+      config[:queues] = ["integration_tests"]
+      config[:environment] = "test"
+      config[:concurrency] = 1
+      config[:timeout] = 1
+      sidekiq = Sidekiq::Launcher.new(config)
       Sidekiq.average_scheduled_poll_interval = 0.5
       Sidekiq.options[:poll_interval_average] = 1
       begin