chore(controller): move cache import to outer

Author: duanhongyi

rootfs/api/backend.py

@@ -2,6 +2,7 @@
 from django.contrib.auth import get_user_model
 from django.core.exceptions import ObjectDoesNotExist
 
+from social_core.utils import cache
 from social_core.backends.oauth import BaseOAuth2
 from social_core.backends.open_id_connect import OpenIdConnectAuth
 
@@ -96,8 +97,6 @@ class DryccOIDC(OpenIdConnectAuth):
         ('scope', 'scope'),
     ]
 
-    from social_core.utils import cache
-
     @cache(ttl=86400)
     def oidc_config(self):
         return self.get_json(self.OIDC_ENDPOINT +