Issue #21651: Fix ResourceWarning when running asyncio tests on Windows.

Patch written by Claudiu Popa.

Lib/test/test_asyncio/test_events.py

@@ -1070,6 +1070,7 @@ class EventLoopTestsMixin:
     def test_internal_fds(self):
         loop = self.create_event_loop()
         if not isinstance(loop, selector_events.BaseSelectorEventLoop):
+            loop.close()
             self.skipTest('loop is not a BaseSelectorEventLoop')
 
         self.assertEqual(1, loop._internal_fds)