🚀 pip: bump virtualenv from 20.25.0 to 20.26.2 (#951)

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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Jürgen Mülbert <jmuelbert@users.noreply.github.com>

requirements.txt

@@ -35,5 +35,5 @@ sphinxcontrib-qthelp==1.0.7
 sphinxcontrib-serializinghtml==1.1.10
 toml==0.10.2
 urllib3==2.2.0
-virtualenv==20.25.0
+virtualenv==20.26.2
 zipp==3.17.0