Remove only async granian

Author: anuraaga

conformance/test/test_server.py

@@ -79,7 +79,7 @@ def test_server_sync(server: str) -> None:
         pytest.fail(f"\n{result.stdout}\n{result.stderr}")
 
 
-@pytest.mark.parametrize("server", ["daphne", "granian", "pyvoy", "uvicorn"])
+@pytest.mark.parametrize("server", ["daphne", "pyvoy", "uvicorn"])
 def test_server_async(server: str) -> None:
     if server == "pyvoy" and sys.platform == "win32":
         pytest.skip("pyvoy not supported on Windows")