test: speed up test suite

tests/channels/test_websocket_channel.py

@@ -136,7 +136,7 @@ def isolate_webui_workspace_state(tmp_path, monkeypatch) -> None:
 async def _http_get(url: str, headers: dict[str, str] | None = None) -> httpx.Response:
     """Run GET in a thread to avoid blocking the asyncio loop shared with websockets."""
     return await asyncio.to_thread(
-        functools.partial(httpx.get, url, headers=headers or {}, timeout=5.0)
+        functools.partial(httpx.get, url, headers=headers or {}, timeout=5.0, trust_env=False)
     )