Migrate to transformers 5

[pmachapman]

This change is 

[codecov-commenter]

Codecov Report

❌ Patch coverage is 68.75000% with 50 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.91%. Comparing base (b152005) to head (2d7748c).

Files with missing lines	Patch %	Lines
...nslation/huggingface/transformers_compatibility.py	62.79%	32 Missing ⚠️
...translation/huggingface/hugging_face_nmt_engine.py	71.05%	11 Missing ⚠️
...tion/huggingface/hugging_face_nmt_model_trainer.py	70.58%	5 Missing ⚠️
.../translation/huggingface/hugging_face_nmt_model.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #363      +/-   ##
==========================================
- Coverage   92.10%   91.91%   -0.19%     
==========================================
  Files         389      390       +1     
  Lines       24559    24616      +57     
==========================================
+ Hits        22620    22626       +6     
- Misses       1939     1990      +51     

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