Merge pull request #341 from staticdev/dependabot/pip/dot-github/workflows/virtualenv-20.7.0

Bump virtualenv from 20.6.0 to 20.7.0 in /.github/workflows

Author: staticdev

.github/workflows/constraints.txt

@@ -2,4 +2,4 @@ pip==21.2.2
 nox==2021.6.12
 nox-poetry==0.8.6
 poetry==1.1.7
-virtualenv==20.6.0
+virtualenv==20.7.0