Bump virtualenv from 20.13.4 to 20.14.1 in /.github/workflows

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.13.4 to 20.14.1.
- [Release notes](https://github.com/pypa/virtualenv/releases)
- [Changelog](https://github.com/pypa/virtualenv/blob/main/docs/changelog.rst)
- [Commits](pypa/virtualenv@20.13.4...20.14.1)

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

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

.github/workflows/constraints.txt

@@ -5,4 +5,4 @@ nox==2022.1.7
 nox-poetry==0.9.0
 poetry==1.1.13
 pre-commit==2.17.0
-virtualenv==20.13.4
+virtualenv==20.14.1