onnxruntime

83c02753 - add bfloat16 support for ConcatTraining and SplitTraining ops (#18280)

add bfloat16 support for ConcatTraining and SplitTraining ops (#18280) ### Description <!-- Describe your changes. --> Updates input/output type constraints on training operators ConcatTraining and SplitTraining to include bfloat16 which was introduced in IR version 4. ### Motivation and Context <!-- - Why is this change required? What problem does it solve? - If it fixes an open issue, please link to the issue here. --> Enabling `meta-llama/Llama-2-70b` to be finetuned with ONNX Runtime training. Co-authored-by: Prathik Rao <prathikrao@microsoft.com@orttrainingdev8.d32nl1ml4oruzj4qz3bqlggovf.px.internal.cloudapp.net>