chore(pip-dev)(deps-dev): bump virtualenv from 20.27.1 to 20.28.0

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.27.1 to 20.28.0.
- [Release notes](https://github.com/pypa/virtualenv/releases)
- [Changelog](https://github.com/pypa/virtualenv/blob/main/docs/changelog.rst)
- [Commits](https://github.com/pypa/virtualenv/compare/20.27.1...20.28.0)

---
updated-dependencies:
- dependency-name: virtualenv
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

requirements-dev.txt

@@ -25,6 +25,6 @@ pytest==8.3.3
 PyYAML==6.0.2
 setuptools==75.6.0
 tomlkit==0.13.2
-virtualenv==20.27.1
+virtualenv==20.28.0
 wrapt==1.17.0
 zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability