Upgrade transformers to 4.48.0 for llama2 (#24302)
### Description
Upgrade Transformers to 4.48.0 for llama2, this version deprecated the
old format of past_key_value, the current format is DynamicCache. So, we
need to add patches to dynamo exporter in llama2.
Thanks to @xadupre who made the changes to add the patches to dynamo
exporter, and implements patches to transformers 4.48.0 which don't
export and convert dynamic_axes into dynamic shapes.
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Co-authored-by: xadupre <xadupre@microsoft.com>
Co-authored-by: Xavier Dupré <xadupre@users.noreply.github.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
