build(deps): bump pytest-asyncio from 0.25.3 to 0.26.0 in /clients/py (#179)

Bumps [pytest-asyncio](https://github.com/pytest-dev/pytest-asyncio) from 0.25.3 to 0.26.0.
- [Release notes](https://github.com/pytest-dev/pytest-asyncio/releases)
- [Commits](pytest-dev/pytest-asyncio@v0.25.3...v0.26.0)

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

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

@@ -8,4 +8,4 @@ pluggy==1.5.0
 pycodestyle==2.12.1
 pyflakes==3.2.0
 pytest==8.3.5
-pytest-asyncio==0.25.3
+pytest-asyncio==0.26.0