Revert mimalloc from v2.0.9 to v2.0.3 (#14603)
Revert mimalloc from v2.0.9 to v2.0.3 to silence build error in
[post-merge
](https://aiinfra.visualstudio.com/Lotus/_build/results?buildId=273075&view=logs&j=f019f681-ae8f-5ee4-d119-02530df66a84&t=6c90c65c-2ab2-56af-633f-b5631256a8e1&l=351)
pipeline.
New dependency version was generated
[here](https://aiinfra.visualstudio.com/Lotus/_artifacts/feed/Lotus/UPack/onnxruntime_build_dependencies/overview/1.0.29).
Co-authored-by: Randy Shuai <rashuai@microsoft.com>
Co-authored-by: rui-ren <ruiren1225@gmail.com>
