Fix CI

pyproject.toml

@@ -17,7 +17,7 @@ dynamic = ["version"]
 test = [
     "pytest",
     "pytest-cov",
-    "pytest-asyncio",
+    "pytest-asyncio==0.21.*",  # https://github.com/pytest-dev/pytest-asyncio/issues/706
     "debugpy",
     "httpx",
     "uvicorn",