ci: bump packaging from 25.0 to 26.0 in /test/requirements

Bumps [packaging](https://github.com/pypa/packaging) from 25.0 to 26.0.
- [Release notes](https://github.com/pypa/packaging/releases)
- [Changelog](https://github.com/pypa/packaging/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/pypa/packaging/compare/25.0...26.0)

---
updated-dependencies:
- dependency-name: packaging
  dependency-version: '26.0'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

test/requirements/python-requirements.txt

@@ -1,6 +1,6 @@
 backoff==2.2.1
 docker==7.1.0
-packaging==25.0
+packaging==26.0
 pytest==9.0.2
 pytest-ignore-flaky==2.2.1
 requests==2.32.5