remove unnecessary check version, and use new way to get datetime

Author: ebertti

Diff for: easy/tests.py

@@ -16,11 +16,7 @@
 from test_app.admin import PollAdmin
 from test_app.models import Question, Poll, Tag
 
-if django.VERSION < (5, 0):
-    from django.utils.datetime_safe import datetime
-else:
-    from django.utils.timezone import datetime
-
+from django.utils.timezone import datetime
 
 class TestSimpleAdminField(test.TestCase):