Fiber#kill doesn't exist until Ruby 3.3

Author: sj26

spec/sidekiq/cloudwatchmetrics_spec.rb

@@ -82,7 +82,10 @@
         expect(fiber.resume).to eql(:sleep)
         expect(fiber.resume).to eql(:publish)
         expect(fiber.resume).to eql(:sleep)
-        fiber.kill
+
+        publisher.stop
+        fiber.resume
+        expect(fiber).not_to be_alive
       end
     end