build(deps): Bump pytest-asyncio in /testing/plugins_integration (#10827

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Bumps [pytest-asyncio](https://github.com/pytest-dev/pytest-asyncio) from 0.20.2 to 0.21.0.
- [Release notes](https://github.com/pytest-dev/pytest-asyncio/releases)
- [Commits](pytest-dev/pytest-asyncio@v0.20.2...v0.21.0)

---
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>

testing/plugins_integration/requirements.txt

@@ -1,6 +1,6 @@
 anyio[curio,trio]==3.6.2
 django==4.1.7
-pytest-asyncio==0.20.2
+pytest-asyncio==0.21.0
 pytest-bdd==6.1.1
 pytest-cov==4.0.0
 pytest-django==4.5.2