Fix dtype error in CI (#8197)

Author: ispobock

python/sglang/srt/layers/moe/topk.py

@@ -524,7 +524,7 @@ def biased_grouped_topk_gpu(
         topk_weights = torch.empty((token, topk), dtype=torch.float32, device=device)
         topk_ids = torch.empty((token, topk), dtype=torch.int32, device=device)
         aiter_biased_grouped_topk(
-            gating_output,
+            gating_output.to(dtype=torch.float32),
             correction_bias,
             topk_weights,
             topk_ids,