update onnx submuole to 994c6181247d7b419b28889fc57d5817e2089419 (microsoft#6042)

duli2012 · Du Li · web-flow · commit 3013289be5cc · 2020-12-06T10:50:34.000-08:00
Co-authored-by: Du Li &lt;duli@OrtTrainingDev0.af05slrtruoetgaxwwjv5nsq5e.px.internal.cloudapp.net&gt;
diff --git a/cmake/external/onnx b/cmake/external/onnx
@@ -1 +1 @@
-Subproject commit 63a586914d51fdfd6d8668e81de043e3d9b0b382
+Subproject commit 994c6181247d7b419b28889fc57d5817e2089419
