Transformers compatibility + evaluation

[alessiodevoto]

PR description

• Transformers released a new version which breaks some parts of the library, so in this PR we changed the dependency while we work on adjusting to the new version.
• Updated evaluation to have a seed in the config.

Checklist

• Tests are working (make test)
• Code is formatted correctly (make style, on errors try fix with make format)
• Copyright header is included
• All commits are signed-off using git commit -s
• (new press) mypress_press.py is in the presses directory
• (new press) MyPress is in __init__.py
• (new press) README.md is updated with a 1 liner about the new press in the Available presses section
• (new press) New press is in the default_presses list in tests/default_presses.py
• (new press) A docstring is provided that follows the same structure as the existing ones

[maxjeblick]

Thanks a lot for the changes, looks good!
I left some comments in the eval code

[maxjeblick]

lgtm!