build(deps): bump virtualenv from 20.8.0 to 20.8.1

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.8.0 to 20.8.1.
- [Release notes](https://github.com/pypa/virtualenv/releases)
- [Changelog](https://github.com/pypa/virtualenv/blob/main/docs/changelog.rst)
- [Commits](pypa/virtualenv@20.8.0...20.8.1)

---
updated-dependencies:
- dependency-name: virtualenv
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -40,5 +40,5 @@ toml==0.10.2
 typed-ast==1.4.3
 typing-extensions==3.10.0.2
 urllib3==1.26.7
-virtualenv==20.8.0
+virtualenv==20.8.1
 wrapt==1.12.1