build(deps): bump virtualenv from 20.26.5 to 20.26.6

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.26.5 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@20.26.5...20.26.6)

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

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

requirements.txt

@@ -68,6 +68,6 @@ tomli==2.0.1
 typing_extensions==4.12.2
 urllib3==2.2.3
 uvicorn==0.31.1
-virtualenv==20.26.5
+virtualenv==20.26.6
 Werkzeug==3.0.4
 wrapt==1.16.0