Oban Jobs for refreshing users were not respecting the uniqueness setting

changelog.d/oban-user-refresh-unique.fix

@@ -0,0 +1 @@
+Oban Jobs for refreshing users were not respecting the uniqueness setting

lib/pleroma/workers/user_refresh_worker.ex

@@ -3,11 +3,11 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Workers.UserRefreshWorker do
-  use Pleroma.Workers.WorkerHelper, queue: "background", max_attempts: 1, unique: [period: 300]
+  use Oban.Worker, queue: :background, max_attempts: 1, unique: [period: 300]
 
   alias Pleroma.User
 
-  @impl Oban.Worker
+  @impl true
   def perform(%Job{args: %{"ap_id" => ap_id}}) do
     User.fetch_by_ap_id(ap_id)
   end