There's a merged pull request on the void-packages repository

python3-virtualenv: update to 20.19.0.
https://github.com/void-linux/void-packages/pull/42134

Description:
#### Testing the changes
- I tested the changes in this PR: **YES**

#### Local build testing
- I built this PR locally for my native architecture: **x86_64**

Upstream changed to pep517 build system and requires the package to be installed for some tests to run.