[auto] Update onnx to 2f7c284 - Use ONNX_NAMESPACE::to_string instead of std::to_string (#797)
https://github.com/onnx/onnx/commit/2f7c284e57c204a966be2edeffe2c2b47b83d812
diff --git a/third_party/onnx b/third_party/onnx
index b20fae0..2f7c284 160000
--- a/third_party/onnx
+++ b/third_party/onnx
@@ -1 +1 @@
-Subproject commit b20fae02876265f6c8f6ff1dbf8b7afe53789c87
+Subproject commit 2f7c284e57c204a966be2edeffe2c2b47b83d812