build(deps): bump virtualenv from 20.25.3 to 20.26.0 in /plc4py (#1555)

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.25.3 to 20.26.0.
- [Release notes](https://github.com/pypa/virtualenv/releases)
- [Changelog](https://github.com/pypa/virtualenv/blob/main/docs/changelog.rst)
- [Commits](pypa/virtualenv@20.25.3...20.26.0)

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

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==6.0.1
 requires==0.10.5
 typing_extensions==4.11.0
-virtualenv==20.25.3
+virtualenv==20.26.0
 xtyping==0.8.2