[auto] Update onnx to 789efb1 - update proto files. (onnx/onnx#1040)
https://github.com/onnx/onnx/commit/789efb166d16b00c498cd789cc19c1c005e0e3aa
diff --git a/third_party/onnx b/third_party/onnx
index ec3b679..789efb1 160000
--- a/third_party/onnx
+++ b/third_party/onnx
@@ -1 +1 @@
-Subproject commit ec3b6797b71663a42d5fe909845e4e25f246d43d
+Subproject commit 789efb166d16b00c498cd789cc19c1c005e0e3aa