build(deps): bump packaging from 25.0 to 26.0 in /clients/py

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](pypa/packaging@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>

Author: dependabot[bot]

clients/py/optional-requirements.txt

@@ -3,7 +3,7 @@ iniconfig==2.3.0
 mccabe==0.7.0
 mypy==1.19.1
 mypy-extensions==1.1.0
-packaging==25.0
+packaging==26.0
 pluggy==1.6.0
 pycodestyle==2.14.0
 pyflakes==3.4.0