Bump virtualenv from 20.25.0 to 20.26.2 in /.github/workflows

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.25.0 to 20.26.2.
- [Release notes](https://github.com/pypa/virtualenv/releases)
- [Changelog](https://github.com/pypa/virtualenv/blob/main/docs/changelog.rst)
- [Commits](pypa/virtualenv@20.25.0...20.26.2)

---
updated-dependencies:
- dependency-name: virtualenv
  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

@@ -2,4 +2,4 @@ pip==24.2
 nox==2022.8.7
 nox-poetry==1.0.2
 poetry==1.6.1
-virtualenv==20.25.0
+virtualenv==20.26.3