re-apply ruff TCH rules

forum/tests.py

@@ -13,15 +13,19 @@
 #
 #
 
+from typing import TYPE_CHECKING
+
 import pytest
 from django.conf import settings
-from django.test import Client
 from django.urls import reverse
 from pytest_django.asserts import assertRedirects
 
 from core.models import User
 from forum.models import Forum, ForumMessage, ForumTopic
 
+if TYPE_CHECKING:
+    from django.test import Client
+
 
 @pytest.mark.django_db
 class TestTopicCreation: