build(deps): bump virtualenv from 20.26.5 to 20.26.6 in /plc4py (#1795)

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.26.5 to 20.26.6.
- [Release notes](https://github.com/pypa/virtualenv/releases)
- [Changelog](https://github.com/pypa/virtualenv/blob/main/docs/changelog.rst)
- [Commits](pypa/virtualenv@20.26.5...20.26.6)

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

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

plc4py/requirements.txt

@@ -50,5 +50,5 @@ pytest-mock==3.14.0
 PyYAML==6.0.2
 requires==0.10.5
 typing_extensions==4.12.2
-virtualenv==20.26.5
+virtualenv==20.26.6
 xtyping==0.8.2