build(deps): bump virtualenv from 20.11.2 to 20.13.0

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.11.2 to 20.13.0.
- [Release notes](https://github.com/pypa/virtualenv/releases)
- [Changelog](https://github.com/pypa/virtualenv/blob/main/docs/changelog.rst)
- [Commits](pypa/virtualenv@20.11.2...20.13.0)

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

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

requirements.txt

@@ -40,5 +40,5 @@ toml==0.10.2
 typed-ast==1.5.1
 typing-extensions==4.0.1
 urllib3==1.26.7
-virtualenv==20.11.2
+virtualenv==20.13.0
 wrapt==1.13.3