Bump virtualenv from 20.2.1 to 20.2.2 in /.github/workflows

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.2.1 to 20.2.2.
- [Release notes](https://github.com/pypa/virtualenv/releases)
- [Changelog](https://github.com/pypa/virtualenv/blob/main/docs/changelog.rst)
- [Commits](pypa/virtualenv@20.2.1...20.2.2)

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

.github/workflows/constraints.txt

@@ -2,4 +2,4 @@ pip==20.3.1
 nox==2020.8.22
 nox-poetry==0.6.0
 poetry==1.0.10
-virtualenv==20.2.1
+virtualenv==20.2.2