Raise limit of test_pipeline_call_is_async further (#1264)

Author: mgoin

tests/deepsparse/pipelines/test_pipeline.py

@@ -160,4 +160,4 @@ def sleep_then_engine_forward(xs, context):
 
         # instead of doing a hard comparison of timing for each separate
         # duration, do relative comparison of timing
-        assert numpy.allclose(dur_1_worker / dur_2_worker, 2, atol=0.15)
+        assert numpy.allclose(dur_1_worker / dur_2_worker, 2, atol=0.4)