Update pytest-asyncio requirement

Updates the requirements on [pytest-asyncio](https://github.com/pytest-dev/pytest-asyncio) to permit the latest version.
- [Release notes](https://github.com/pytest-dev/pytest-asyncio/releases)
- [Commits](pytest-dev/pytest-asyncio@v0.15.1...v0.23.3)

---
updated-dependencies:
- dependency-name: pytest-asyncio
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements_test.txt

@@ -5,6 +5,6 @@ isort==5.13.2
 mypy==1.8.0
 types-protobuf==4.24.0.4
 pytest>=6.2.4,<8
-pytest-asyncio>=0.15.1,<=0.21.1
+pytest-asyncio>=0.15.1,<=0.23.3
 mock>=4.0.3,<6
 pytest-cov>=4.1.0