build(deps): bump pytest from 9.1.0 to 9.1.1 in /clients/py (#752)

Bumps [pytest](https://github.com/pytest-dev/pytest) from 9.1.0 to 9.1.1.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@9.1.0...9.1.1)

---
updated-dependencies:
- dependency-name: pytest
  dependency-version: 9.1.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

clients/py/optional-requirements.txt

@@ -7,5 +7,5 @@ packaging==26.2
 pluggy==1.6.0
 pycodestyle==2.14.0
 pyflakes==3.4.0
-pytest==9.1.0
+pytest==9.1.1
 pytest-asyncio==1.4.0