Update oban_jobs priority

Fixes #213

priv/repo/migrations/20220718102634_upgrade_oban_to_v11.exs

@@ -1,7 +1,10 @@
 defmodule Pleroma.Repo.Migrations.UpgradeObanToV11 do
   use Ecto.Migration
 
-  def up, do: Oban.Migrations.up(version: 11)
+  def up do
+    execute("UPDATE oban_jobs SET priority = 0 WHERE priority IS NULL;")
+    Oban.Migrations.up(version: 11)
+  end
 
   def down, do: Oban.Migrations.down(version: 11)
 end