chore(pip-prod)(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](https://github.com/pypa/virtualenv/compare/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] <support@github.com>

requirements.txt

@@ -39,7 +39,7 @@ toml==0.10.2
 tomli==2.0.1
 tomlkit==0.13.2
 urllib3==2.2.3
-virtualenv==20.26.5
+virtualenv==20.26.6
 webex-bot==0.5.2
 webexteamssdk==1.6.1
 websockets==11.0.3