[CI] Pin helion version (#37012)

Signed-off-by: Yanan Cao <gmagogsfm@gmail.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

setup.py

@@ -982,7 +982,7 @@ setup(
         # Optional deps for AMD FP4 quantization support
         "petit-kernel": ["petit-kernel"],
         # Optional deps for Helion kernel development
-        "helion": ["helion"],
+        "helion": ["helion==0.3.2"],
         # Optional deps for gRPC server (vllm serve --grpc)
         "grpc": ["smg-grpc-servicer[vllm] >= 0.5.0"],
         # Optional deps for OpenTelemetry tracing