chore: bump virtualenv to v21.7.8

Signed-off-by: Keshav Priyadarshi <git@keshav.space>

Author: keshav-space

etc/thirdparty/virtualenv.pyz

@@ -1,7 +1,7 @@
 about_resource: virtualenv.pyz
 name: get-virtualenv
-version: 20.16.5
-download_url: https://github.com/pypa/get-virtualenv/raw/20.16.5/public/virtualenv.pyz
+version: 21.7.8
+download_url: https://github.com/pypa/get-virtualenv/raw/21.7.8/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
@@ -10,4 +10,4 @@ copyright: Copyright (c) The Python Software Foundation and others
 redistribute: yes
 attribute: yes
 track_changes: yes
-package_url: pkg:github/pypa/get-virtualenv@20.16.5#public/virtualenv.pyz
+package_url: pkg:github/pypa/get-virtualenv@21.7.8#public/virtualenv.pyz