fix: fix Elixir 1.15 depreciations

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

lib/graphql/api/reports.ex

@@ -57,7 +57,7 @@ defmodule Mobilizon.GraphQL.API.Reports do
           end
 
         if antispam_response != :ok do
-          Logger.warn("Antispam response has been #{inspect(antispam_response)}")
+          Logger.warning("Antispam response has been #{inspect(antispam_response)}")
         end
 
         {:ok, report}

lib/graphql/error.ex

@@ -123,7 +123,7 @@ defmodule Mobilizon.GraphQL.Error do
   defp metadata(:unknown), do: {500, dgettext("errors", "Something went wrong")}
 
   defp metadata(code) do
-    Logger.warn("Unhandled error code: #{inspect(code)}")
+    Logger.warning("Unhandled error code: #{inspect(code)}")
     {422, to_string(code)}
   end