Accelerate execution of test_task_details

A s3 mock was missing. Improves test time for module arkindex.ponos.tests.test_api (11.9s -> 2.9s).

arkindex/ponos/tests/test_api.py

@@ -111,6 +111,7 @@ class TestAPI(FixtureAPITestCase):
             resp = self.client.get(reverse("api:task-details", args=[self.task1.id]))
             self.assertEqual(resp.status_code, status.HTTP_403_FORBIDDEN)
 
+    @patch("arkindex.project.aws.s3")
     @expectedFailure
     def test_task_details_requires_process_guest(self):
         self.process.creator = self.superuser