fix: balancing act for subscription (#224)

Author: supercaracal

lib/redis_client/cluster/pub_sub.rb

@@ -65,7 +65,7 @@ def next_event(timeout = nil)
         loop do
           break if max_duration > 0 && obtain_current_time - starting > max_duration
 
-          @states.each_value do |pubsub|
+          @states.values.shuffle.each do |pubsub|
             message = pubsub.take_message(timeout)
             return message if message
           end