Bump virtualenv from 20.13.0 to 20.13.1 (#813)

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.13.0 to 20.13.1.
- [Release notes](https://github.com/pypa/virtualenv/releases)
- [Changelog](https://github.com/pypa/virtualenv/blob/main/docs/changelog.rst)
- [Commits](pypa/virtualenv@20.13.0...20.13.1)

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

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