Bump virtualenv from 20.23.0 to 20.23.1

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.23.0 to 20.23.1.
- [Release notes](https://github.com/pypa/virtualenv/releases)
- [Changelog](https://github.com/pypa/virtualenv/blob/main/docs/changelog.rst)
- [Commits](pypa/virtualenv@20.23.0...20.23.1)

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

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

requirements-dev.txt

@@ -88,5 +88,5 @@ types-setuptools==67.8.0.0
     # via types-pygments
 typing-extensions==4.6.2
     # via mypy
-virtualenv==20.23.0
+virtualenv==20.23.1
     # via tox