build(deps-dev): bump virtualenv from 20.26.6 to 20.29.1 in /packages

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.26.6 to 20.29.1.
- [Release notes](https://github.com/pypa/virtualenv/releases)
- [Changelog](https://github.com/pypa/virtualenv/blob/main/docs/changelog.rst)
- [Commits](pypa/virtualenv@20.26.6...20.29.1)

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

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

packages/requirements-dev.txt

@@ -125,7 +125,7 @@ typing-extensions==4.12.2 ; python_version >= "3.9" and python_version < "4.0"
 tzdata==2024.2 ; python_version >= "3.9" and python_version < "4.0" and sys_platform == "win32"
 untokenize==0.1.1 ; python_version >= "3.9" and python_version < "4.0"
 urllib3==2.2.3 ; python_version >= "3.9" and python_version < "4.0"
-virtualenv==20.26.6 ; python_version >= "3.9" and python_version < "4.0"
+virtualenv==20.29.1 ; python_version >= "3.9" and python_version < "4.0"
 wcwidth==0.2.13 ; python_version >= "3.9" and python_version < "4.0"
 xattr==1.1.0 ; python_version >= "3.9" and python_version < "4.0" and sys_platform == "darwin"
 zipp==3.20.2 ; python_version >= "3.9" and python_version < "3.12"