fix type issue

Signed-off-by: Kunshang Ji <kunshang.ji@intel.com>

Author: jikunshang

vllm/model_executor/layers/rotary_embedding/llama4_vision_rope.py

@@ -89,6 +89,6 @@ def forward_hip(  # type: ignore[override]
     def forward_xpu(  # type: ignore[override]
         self,
         query: torch.Tensor,
-        key: Optional[torch.Tensor] = None,
-    ) -> tuple[torch.Tensor, Optional[torch.Tensor]]:
+        key: torch.Tensor | None = None,
+    ) -> tuple[torch.Tensor, torch.Tensor | None]:
         return self.forward_native(query, key)