[CI] Fix mypy for vllm/v1/core and vllm/v1/engine (#27108)

Signed-off-by: yewentao256 <zhyanwentao@126.com>

vllm/engine/protocol.py

@@ -77,6 +77,7 @@ class EngineClient(ABC):
         lora_request: LoRARequest | None = None,
         trace_headers: Mapping[str, str] | None = None,
         priority: int = 0,
+        truncate_prompt_tokens: int | None = None,
         tokenization_kwargs: dict[str, Any] | None = None,
     ) -> AsyncGenerator[PoolingRequestOutput, None]:
         """Generate outputs for a request from a pooling model."""