Fix single Redis connection being used across all threads (#18135)

* Fix single Redis connection being used across all Sidekiq threads

* Fix tests

app/services/vote_service.rb

@@ -3,6 +3,7 @@
 class VoteService < BaseService
   include Authorization
   include Payloadable
+  include Redisable
 
   def call(account, poll, choices)
     authorize_with account, poll, :vote?
@@ -77,6 +78,6 @@ class VoteService < BaseService
   end
 
   def lock_options
-    { redis: Redis.current, key: "vote:#{@poll.id}:#{@account.id}" }
+    { redis: redis, key: "vote:#{@poll.id}:#{@account.id}" }
   end
 end