Bump pytest-asyncio from 0.19.0 to 0.20.3 (#430)

Bumps [pytest-asyncio](https://github.com/pytest-dev/pytest-asyncio) from 0.19.0 to 0.20.3.
- [Release notes](https://github.com/pytest-dev/pytest-asyncio/releases)
- [Changelog](https://github.com/pytest-dev/pytest-asyncio/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest-asyncio/compare/v0.19.0...v0.20.3)

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

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pyproject.toml

@@ -58,7 +58,7 @@ coverage = "^6.4"
 pytest-cov = "^4.0.0"
 pytest-xdist = "^3.1.0"
 unasync = "^0.5.0"
-pytest-asyncio = "^0.19.0"
+pytest-asyncio = "^0.20.3"
 email-validator = "^1.3.0"
 tox = "^3.26.0"
 tox-pyenv = "^1.1.0"