anchor transformers version (#7316)
some features require minimal transformers versions so let's start
anchoring.
and fixing tests that break with recent transformers.
I need this fixed to be able to merge
https://github.com/deepspeedai/DeepSpeed/pull/7268 which requires
`transformers>=4.51.3`
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Signed-off-by: Stas Bekman <stas.bekman@snowflake.com>
Co-authored-by: Stas Bekman <stas.bekman@snowflake.com>
