[1.8.x] Fixed warning leak in static.serve() test

Partial forward port of b1bf8d64fb from 1.7.x. Refs #24193.

docs/releases/1.7.4.txt

@@ -17,3 +17,6 @@ Bugfixes
 
 * Fixed a migration crash on MySQL when migrating from a ``OneToOneField`` to a
   ``ForeignKey`` (:ticket:`24163`).
+
+* Prevented the ``static.serve`` view from producing ``ResourceWarning``\s in
+  certain circumstances (security fix regression, :ticket:`24193`).

tests/view_tests/tests/test_static.py

@@ -38,6 +38,7 @@ class StaticTests(SimpleTestCase):
         first_chunk = next(response.streaming_content)
         self.assertEqual(len(first_chunk), FileResponse.block_size)
         second_chunk = next(response.streaming_content)
+        response.close()
         # strip() to prevent OS line endings from causing differences
         self.assertEqual(len(second_chunk.strip()), 1449)