Decrease tox parallelism

Author: igorborgest

tox.ini

@@ -8,11 +8,11 @@ deps =
        moto
        -rrequirements-torch.txt
 commands =
-       pytest -n 16 testing/test_awswrangler
+       pytest -n 8 testing/test_awswrangler
 
 [testenv:py36]
 deps =
        {[testenv]deps}
        pytest-cov
 commands =
-       pytest --cov=awswrangler -n 16 testing/test_awswrangler
+       pytest --cov=awswrangler -n 8 testing/test_awswrangler