fix: import guid context var from context module

django_guid/log_filters.py

@@ -1,7 +1,7 @@
 from logging import Filter
 from typing import TYPE_CHECKING
 
-from django_guid.middleware import guid
+from django_guid.context import guid
 
 if TYPE_CHECKING:
     from logging import LogRecord

django_guid/signals.py

@@ -4,7 +4,7 @@
 from django.core.signals import request_finished
 from django.dispatch import receiver
 
-from django_guid.middleware import guid
+from django_guid.context import guid
 
 logger = logging.getLogger('django_guid')