Bump virtualenv

Signed-off-by: Philippe Ombredanne <[email protected]>

Author: pombredanne

etc/thirdparty/virtualenv.pyz

@@ -1,7 +1,7 @@
 about_resource: virtualenv.pyz
 name: get-virtualenv
-version: 20.13.3
-download_url: https://github.com/pypa/get-virtualenv/raw/20.13.3/public/virtualenv.pyz
+version: 20.16.1
+download_url: https://github.com/pypa/get-virtualenv/raw/20.16.1/public/virtualenv.pyz
 description: virtualenv is a tool to create isolated Python environments.
 homepage_url: https://github.com/pypa/virtualenv
 license_expression: lgpl-2.1-plus AND (bsd-new OR apache-2.0) AND mit AND python AND bsd-new