Update dependency virtualenv to v20.16.4

This MR contains the following updates:

Package	Update	Change
virtualenv (source)	patch	==20.16.3 -> ==20.16.4

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Release Notes

pypa/virtualenv

v20.16.4

Compare Source

What's Changed

• release 20.16.3 by @​gaborbernat in https://github.com/pypa/virtualenv/pull/2396
• Remove universal wheel, python 2 is unsupported by @​gopackgo90 in https://github.com/pypa/virtualenv/pull/2402
• Bump setuptools by @​gaborbernat in https://github.com/pypa/virtualenv/pull/2405

New Contributors

• @​gopackgo90 made their first contribution in https://github.com/pypa/virtualenv/pull/2402

Full Changelog: https://github.com/pypa/virtualenv/compare/20.16.3...20.16.4

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