Bump virtualenv from 20.24.5 to 20.26.6

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.24.5 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@20.24.5...20.26.6)

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

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

Author: dependabot[bot]

requirements-dev.txt

@@ -33,6 +33,6 @@ setuptools==70.0.0; python_version >= '3.8'
 six==1.16.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
 toml==0.10.2; python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2, 3.3'
 urllib3==2.2.2; python_version >= '3.7'
-virtualenv==20.24.5; python_version >= '3.7'
+virtualenv==20.26.6; python_version >= '3.7'
 watchdog==3.0.0; python_version >= '3.7'
 werkzeug==3.0.3; python_version >= '3.8'