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

Bumps [pytest-asyncio](https://github.com/pytest-dev/pytest-asyncio) from 0.17.2 to 0.18.1.
- [Release notes](https://github.com/pytest-dev/pytest-asyncio/releases)
- [Commits](https://github.com/pytest-dev/pytest-asyncio/compare/v0.17.2...v0.18.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

testing/plugins_integration/requirements.txt

@@ -1,6 +1,6 @@
 anyio[curio,trio]==3.5.0
 django==4.0.2
-pytest-asyncio==0.17.2
+pytest-asyncio==0.18.1
 pytest-bdd==5.0.0
 pytest-cov==3.0.0
 pytest-django==4.5.2