build(deps-dev): bump virtualenv in the pip group across 1 directory (#18)

Bumps the pip group with 1 update in the / directory: [virtualenv](https://github.com/pypa/virtualenv).


Updates `virtualenv` from 20.25.0 to 20.26.6
- [Release notes](https://github.com/pypa/virtualenv/releases)
- [Changelog](https://github.com/pypa/virtualenv/blob/main/docs/changelog.rst)
- [Commits](pypa/virtualenv@20.25.0...20.26.6)

---
updated-dependencies:
- dependency-name: virtualenv
  dependency-type: indirect
  dependency-group: pip
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]