Limit pytest-asyncio even more - to <0.23.0 (#36040)

Seems that the pytest-asyncio problem was already introduced by
0.23.0. In order to allow tests passing now, we should limit it
to below that version (follow up after #36037)

setup.py

@@ -477,7 +477,7 @@ def write_version(filename: str = str(AIRFLOW_SOURCES_ROOT / "airflow" / "git_ve
     "pytest>=7.1",
     # Pytest-asyncio 0.23.1 breaks our tests. The limitation should be removed when the issue is fixed:
     # https://github.com/pytest-dev/pytest-asyncio/issues/703
-    "pytest-asyncio<0.23.1",
+    "pytest-asyncio<0.23.0",
     "pytest-cov",
     "pytest-httpx",
     "pytest-icdiff",