Update packaging to 21.3

[pyup-bot]

This PR updates packaging from 21.2 to 21.3.

Changelog

21.3

~~~~~~~~~~~~~~~~~

* Add a ``pp3-none-any`` tag (:issue:`311`)
* Replace the blank pyparsing 3 exclusion with a 3.0.5 exclusion (:issue:`481`, :issue:`486`)
* Fix a spelling mistake (:issue:`479`)

Links

• PyPI: https://pypi.org/project/packaging
• Changelog: https://pyup.io/changelogs/packaging/
• Repo: https://github.com/pypa/packaging

[coveralls]

Coverage remained the same at 90.265% when pulling bfb8fac on pyup-update-packaging-21.2-to-21.3 into ebbf61c on develop.