fix: custom sidekiq class must inherit from interactor class

Author: sam-albon-li

lib/interactor/sidekiq.rb

@@ -87,11 +87,9 @@ def sidekiq_worker_class(klass)
     def worker_class
       return Worker if custom_sidekiq_worker_class.nil?
 
-      custom_sidekiq_worker_class.tap do |klass|
-        unless klass.is_a?(Worker)
-          raise "#{klass} is not a valid Sidekiq worker class. It must be a subclass of ::Interactor::SidekiqWorker::Worker."
-        end
-      end
+      return custom_sidekiq_worker_class if custom_sidekiq_worker_class < Worker
+
+      raise "#{klass} is not a valid Sidekiq worker class. It must be a subclass of ::Interactor::SidekiqWorker::Worker."
     end
 
     def handle_context_for_sidekiq(context)