fix: keycloak address displaying (blockscout#14155)

Author: sl1depengwyn

apps/explorer/lib/explorer/third_party_integrations/keycloak.ex

@@ -475,7 +475,7 @@ defmodule Explorer.ThirdPartyIntegrations.Keycloak do
   defp do_send_registration_webhook(_email, nil), do: :ok
 
   defp create_auth(user, address_hash \\ nil) do
-    address_hash = address_hash || List.first(user["attributes"]["address"] || [])
+    address_hash = address_hash || List.last(user["attributes"]["address"] || [])
 
     %Auth{
       uid: user["id"],