[CI] Fix nightly CI (#3821)

### What this PR does / why we need it?
This patch fix the nightly CI runs
[failure](https://github.com/vllm-project/vllm-ascend/actions/runs/18848144365)

### Does this PR introduce _any_ user-facing change?

### How was this patch tested?


- vLLM version: v0.11.0rc3
- vLLM main:
https://github.com/vllm-project/vllm/commit/releases/v0.11.1

---------

Signed-off-by: wangli <wangli858794774@gmail.com>

tests/e2e/conftest.py

@@ -116,7 +116,7 @@ class RemoteOpenAIServer:
                  model: str,
                  vllm_serve_args: Union[list[str], str],
                  *,
-                 server_host: str = "0.0.0.0",
+                 server_host: str = '0.0.0.0',
                  server_port: int = 8080,
                  env_dict: Optional[dict[str, str]] = None,
                  seed: Optional[int] = None,