Bump virtualenv from 20.0.25 to 20.26.6 (#1451)

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.0.25 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@20.0.25...20.26.6)

---
updated-dependencies:
- dependency-name: virtualenv
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -32,7 +32,7 @@ six==1.15.0
 SQLAlchemy==1.3.17
 toml==0.10.1
 typed-ast==1.4.1
-virtualenv==20.0.25
+virtualenv==20.26.6
 Werkzeug==3.0.6
 wrapt==1.12.1
 zipp==3.15.0