update onnx.patch to apply wasm build break fix (#17104)
### Description
This PR fixes build break for WebAssembly introduced in
6986981482086832d897a9b3241987c04c0a64cf
(https://github.com/onnx/onnx/commit/435ad2b1d80f67e5e85e83092bbd6d3900f40806).
This change updates onnx.patch in onnxruntime repo. the corresponding PR
in onnx repo is: https://github.com/onnx/onnx/pull/5495.
It may takes a while for the next onnx version bump.
