Update dependency packaging to v20.9

This MR contains the following updates:

Package	Update	Change
packaging	minor	==20.4 -> ==20.9

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Release Notes

pypa/packaging

v20.9

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• Run isort over the code base (:issue:377)
• Add support for the macosx_10_*_universal2 platform tags (:issue:379)
• Introduce packaging.utils.parse_wheel_filename() and parse_sdist_filename() (:issue:387 and :issue:389)

v20.8

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• Revert back to setuptools for compatibility purposes for some Linux distros (:issue:363)
• Do not insert an underscore in wheel tags when the interpreter version number is more than 2 digits (:issue:372)

v20.7

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v20.6

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v20.5

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