[integration] Add support for Transformers v4.46.0

[tomaarsen]

Resolves #3021

Hello!

Pull Request overview

• Add support for Transformers v4.46.0:
  1. Use "processing_class" argument instead of "tokenizers" if transformers is at >= 4.46.0
  2. Add an unused num_items_in_batch argument to compute_loss

Details

I've made two small changes to add support with the new transformers v4.46.0.
The first issue is due to huggingface/transformers#32385
The second is due to huggingface/transformers#34198 cc @muellerzr

Thanks for reporting @dipanjanS! cc @BelisaDi as you also commented in #3021

• Tom Aarsen