test(macos): soften test to account for macOS polling differences

Author: dvarrazzo

tests/test_async.py

@@ -504,7 +504,7 @@ def test_non_block_after_notification(self):
                 raise Exception("Unexpected result from poll: %r", state)
             polls += 1
 
-        self.assert_(polls >= 8, polls)
+        self.assert_(polls >= 5, polls)
 
     def test_poll_noop(self):
         self.conn.poll()