Update dependency packaging to v21.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
packaging	==21.0 -> ==21.3

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Release Notes

pypa/packaging

v21.3

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• Add a pp3-none-any tag (#​311)
• Replace the blank pyparsing 3 exclusion with a 3.0.5 exclusion (#​481, #​486)
• Fix a spelling mistake (#​479)

v21.2

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• Update changelog entry for 21.1

Full Changelog: pypa/packaging@21.1...21.2

v21.1

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What's Changed

• Update branch names in release process in https://github.com/pypa/packaging/pull/444
• Update changelog for 21.0 in https://github.com/pypa/packaging/pull/449
• tags: make _platform_tags public inhttps://github.com/pypa/packaging/pull/4466
• Add support for Python 3.10 in https://github.com/pypa/packaging/pull/461
• Update PyPy CI Specifier in https://github.com/pypa/packaging/pull/467
• Limit pyparsing to major version 2 in https://github.com/pypa/packaging/pull/471

New Contributors

• @​moyiz made their first contribution in https://github.com/pypa/packaging/pull/471

Full Changelog: pypa/packaging@21.0...21.1

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