Bump virtualenv from 20.28.0 to 20.29.1 (#3405)

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.28.0 to 20.29.1.
- [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/20.28.0...20.29.1)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

dev-requirements.txt

@@ -256,7 +256,7 @@ uritemplate==4.1.1
     #   modoboa (pyproject.toml)
 urllib3==2.2.3
     # via requests
-virtualenv==20.28.0
+virtualenv==20.29.1
     # via pre-commit
 werkzeug==3.1.3
     # via modoboa (pyproject.toml)

test-requirements.txt

@@ -239,7 +239,7 @@ uritemplate==4.1.1
     #   modoboa (pyproject.toml)
 urllib3==2.2.3
     # via requests
-virtualenv==20.28.0
+virtualenv==20.29.1
     # via tox
 zope-event==5.0
     # via gevent