Bump virtualenv from 20.4.3 to 20.29.2

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.4.3 to 20.29.2.
- [Release notes](https://github.com/pypa/virtualenv/releases)
- [Changelog](https://github.com/pypa/virtualenv/blob/main/docs/changelog.rst)
- [Commits](pypa/virtualenv@20.4.3...20.29.2)

---
updated-dependencies:
- dependency-name: virtualenv
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

host/requirements.txt

@@ -26,6 +26,6 @@ six==1.15.0
 supervisor==4.2.2
 toml==0.10.2
 urllib3==1.26.4
-virtualenv==20.4.3
+virtualenv==20.29.2
 visitor==0.1.3
 Werkzeug==1.0.1