change: upgrade pytest and other deps, tox clean-up

[metrizable]

Issue #, if available:

Description of changes:

changes include:

• updates to pytest, others
• tox.ini clean-up

Testing done:

unit:

❯ tox --parallel 3 -- -rfE tests/unit
✔ OK flake8 in 23.903 seconds
✔ OK black-format in 35.327 seconds
✔ OK pylint in 35.914 seconds
✔ OK twine in 42.676 seconds
✔ OK doc8 in 39.389 seconds
✔ OK sphinx in 2 minutes, 45.049 seconds
✔ OK py36 in 6 minutes, 55.709 seconds
✔ OK py37 in 7 minutes, 2.104 seconds
✔ OK py38 in 5 minutes, 41.539 seconds

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[bveeramani]

LGTM

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• CodeBuild project: sagemaker-python-sdk-pr
• Commit ID: b5e8752
• Result: SUCCEEDED
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