[Chore]: qwen3-moe-type-hints-mistake (#19860)

Co-authored-by: xinnan.hou <hxn02029096@alibaba-inc.com>

vllm/model_executor/models/qwen3_moe.py

@@ -294,7 +294,7 @@ class Qwen3MoeDecoderLayer(nn.Module):
         positions: torch.Tensor,
         hidden_states: torch.Tensor,
         residual: Optional[torch.Tensor],
-    ) -> torch.Tensor:
+    ) -> tuple[torch.Tensor, torch.Tensor]:
         # Self Attention
         if residual is None:
             residual = hidden_states