Bump pytest-asyncio from 0.20.3 to 0.21.0 (#22)

Bumps [pytest-asyncio](https://github.com/pytest-dev/pytest-asyncio) from 0.20.3 to 0.21.0.
- [Release notes](https://github.com/pytest-dev/pytest-asyncio/releases)
- [Commits](pytest-dev/pytest-asyncio@v0.20.3...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>

requirements_test.txt

@@ -1,7 +1,7 @@
 -r requirements_base.txt
 asynctest==0.13.0
 pytest==7.2.2
-pytest-asyncio==0.20.3
+pytest-asyncio==0.21.0
 pytest-cov==4.0.0
 pytest-socket==0.6.0
 aioresponses==0.7.4