Fix errors

Signed-off-by: Tushar Goel <tushar.goel.dav@gmail.com>

Author: TG1999

vulnerabilities/tests/test_data_migrations.py

@@ -1077,7 +1077,7 @@ def setUpBeforeMigration(self, apps):
         )
 
     def test_no_duplicate_is_latest_for_avid(self):
-        AdvisoryV2 = apps.get_model("vulnerabilities", "AdvisoryV2")
+        AdvisoryV2 = self.apps.get_model("vulnerabilities", "AdvisoryV2")
 
         duplicate = (
             AdvisoryV2.objects.filter(is_latest=True)
@@ -1089,7 +1089,7 @@ def test_no_duplicate_is_latest_for_avid(self):
         self.assertFalse(duplicate.exists())
 
     def test_latest_is_actually_recent(self):
-        AdvisoryV2 = apps.get_model("vulnerabilities", "AdvisoryV2")
+        AdvisoryV2 = self.apps.get_model("vulnerabilities", "AdvisoryV2")
 
         latest = AdvisoryV2.objects.get(avid="test_pipeline/test_adv", is_latest=True)
         self.assertEqual("New advisory", latest.summary)