Bump virtualenv from 20.28.0 to 20.28.1

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.28.0 to 20.28.1.
- [Release notes](https://github.com/pypa/virtualenv/releases)
- [Changelog](https://github.com/pypa/virtualenv/blob/main/docs/changelog.rst)
- [Commits](pypa/virtualenv@20.28.0...20.28.1)

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

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

Author: dependabot[bot]

requirements.txt

@@ -277,7 +277,7 @@ uritemplate==4.1.1
     # via coreapi
 urllib3==2.3.0
     # via requests
-virtualenv==20.28.0
+virtualenv==20.28.1
     # via tox
 wcwidth==0.2.13
     # via prompt-toolkit