Bump virtualenv from 20.30.0 to 20.34.0 in /.github/workflows

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.30.0 to 20.34.0.
- [Release notes](https://github.com/pypa/virtualenv/releases)
- [Changelog](https://github.com/pypa/virtualenv/blob/main/docs/changelog.rst)
- [Commits](pypa/virtualenv@20.30.0...20.34.0)

---
updated-dependencies:
- dependency-name: virtualenv
  dependency-version: 20.34.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/constraints.txt

@@ -1,5 +1,5 @@
 pip==25.0.1
 nox==2025.2.9
 nox-poetry==1.2.0
-virtualenv==20.30.0
+virtualenv==20.34.0
 poetry==1.8.4