build(deps): bump virtualenv from 21.5.0 to 21.7.13

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 21.5.0 to 21.7.13.
- [Release notes](https://github.com/pypa/virtualenv/releases)
- [Changelog](https://github.com/pypa/virtualenv/blob/main/docs/changelog.rst)
- [Commits](pypa/virtualenv@21.5.0...21.7.13)

---
updated-dependencies:
- dependency-name: virtualenv
  dependency-version: 21.7.13
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]