style: fix black formatting in apps.py

casbin_adapter/apps.py

diff --git a/casbin_adapter/apps.py b/casbin_adapter/apps.py
index 28d3b75..7089688 100644
--- a/casbin_adapter/apps.py
+++ b/casbin_adapter/apps.py
@@ -7,4 +7,5 @@
 
     def ready(self):
         from .enforcer import enforcer
+
         enforcer.db_alias = getattr(settings, "CASBIN_DB_ALIAS", "default")