test: fix depreciated warn log levels in tests

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

test/federation/activity_pub/transmogrifier/comments_test.exs

@@ -213,7 +213,7 @@ defmodule Mobilizon.Federation.ActivityPub.Transmogrifier.CommentsTest do
           {:ok, %Tesla.Env{status: 404, body: "Not found"}}
       end)
 
-      assert capture_log([level: :warn], fn ->
+      assert capture_log([level: :warning], fn ->
                {:ok, _returned_activity, _entity} = Transmogrifier.handle_incoming(data)
              end) =~ "[warning] Parent object is something we don't handle"
     end

test/federation/activity_pub/transmogrifier/join_test.exs

@@ -132,7 +132,7 @@ defmodule Mobilizon.Federation.ActivityPub.Transmogrifier.JoinTest do
       assert reject_activity.data["id"] =~ "/reject/join/"
 
       # We don't accept already rejected Reject activities
-      assert capture_log([level: :warn], fn ->
+      assert capture_log([level: :warning], fn ->
                assert :error == Transmogrifier.handle_incoming(reject_data)
              end) =~
                "Tried to handle an Reject activity on a Join activity with a event object but the participant is already rejected"

test/federation/activity_pub/transmogrifier/update_test.exs

@@ -66,7 +66,7 @@ defmodule Mobilizon.Federation.ActivityPub.Transmogrifier.UpdateTest do
         |> Map.put("actor", relay_actor_url)
         |> Map.put("object", object)
 
-      assert capture_log([level: :warn], fn ->
+      assert capture_log([level: :warning], fn ->
                :error = Transmogrifier.handle_incoming(update_data)
              end) =~ "[warning] Activity tried to update an actor that's local or not a group"