Fix follow requests N+1 (#12004)

app/services/update_account_service.rb

@@ -21,7 +21,7 @@ class UpdateAccountService < BaseService
 
   def authorize_all_follow_requests(account)
     follow_requests = FollowRequest.where(target_account: account)
-    follow_requests = follow_requests.select { |req| !req.account.silenced? }
+    follow_requests = follow_requests.preload(:account).select { |req| !req.account.silenced? }
     AuthorizeFollowWorker.push_bulk(follow_requests) do |req|
       [req.account_id, req.target_account_id]
     end