build(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](pypa/virtualenv@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] <[email protected]>

{{ cookiecutter.project_slug }}/dev-requirements.txt

@@ -57,7 +57,7 @@ ruff==0.8.0
     # via {{ cookiecutter.project_slug }} (pyproject.toml)
 typing-extensions==4.12.2
     # via mypy
-virtualenv==20.27.1
+virtualenv==20.28.0
     # via pre-commit
 wheel==0.45.1
     # via pip-tools