Update dependency packaging to v20.9

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
packaging	==20.4 -> ==20.9

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Release Notes

pypa/packaging (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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Configuration

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻️ Renovate will retry this branch, including artifacts, only when one of the following happens:

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The artifact failure details are included below:

File name: requirements.txt

Using default tag: latest
latest: Pulling from renovate/python
83ee3a23efb7: Pulling fs layer
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