use correct versions for oban migrations

priv/repo/migrations/20190730055101_add_oban_jobs_table.exs

@@ -1,6 +1,9 @@
 defmodule Pleroma.Repo.Migrations.AddObanJobsTable do
   use Ecto.Migration
 
-  defdelegate up, to: Oban.Migrations
+  def up do
+    Oban.Migrations.up(version: 2)
+  end
+
   defdelegate down, to: Oban.Migrations
 end

priv/repo/migrations/20190917100019_update_oban.exs

@@ -6,6 +6,6 @@ def up do
   end
 
   def down do
-    Oban.Migrations.down(version: 2)
+    Oban.Migrations.down(version: 3)
   end
 end

priv/repo/migrations/20200402063221_update_oban_jobs_table.exs

@@ -6,6 +6,6 @@ def up do
   end
 
   def down do
-    Oban.Migrations.down(version: 7)
+    Oban.Migrations.down(version: 8)
   end
 end