build(deps): Bump pytest-asyncio in /testing/plugins_integration (#13336)

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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

testing/plugins_integration/requirements.txt

@@ -1,6 +1,6 @@
 anyio[trio]==4.9.0
 django==5.1.7
-pytest-asyncio==0.25.3
+pytest-asyncio==0.26.0
 pytest-bdd==8.1.0
 pytest-cov==6.0.0
 pytest-django==4.10.0