Bump virtualenv from 16.2.0 to 20.0.29
Bump virtualenv from 16.2.0 to 20.0.29

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 16.2.0 to 20.0.29.
- [Release notes](https://github.com/pypa/virtualenv/releases)
- [Changelog](https://github.com/pypa/virtualenv/blob/master/docs/changelog.rst)
- [Commits](https://github.com/pypa/virtualenv/compare/16.2.0...20.0.29)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
thaJeztah/compose,vdemeester/compose,vdemeester/compose,thaJeztah/compose