Bump pytest-asyncio from 0.14.0 to 0.15.0 (#28)

Bumps [pytest-asyncio](https://github.com/pytest-dev/pytest-asyncio) from 0.14.0 to 0.15.0.
- [Release notes](https://github.com/pytest-dev/pytest-asyncio/releases)
- [Commits](pytest-dev/pytest-asyncio@v0.14.0...v0.15.0)

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requirements_test.txt

@@ -3,4 +3,4 @@ mypy==0.812
 pre-commit==2.12.1
 pylint==2.7.4
 pytest==6.2.3
-pytest-asyncio==0.14.0
+pytest-asyncio==0.15.0