fix ci: account for huggingface transformers changes

[mattseddon]

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---

This PR fixes the test_huggingface_integration test. Check the inline comment for an explanation.

Closes #768

[mattseddon]

My current theory is that a second instance of DVCLiveCallback is being attached to the Trainer.

[codecov-commenter]

Codecov Report

Attention: 30 lines in your changes are missing coverage. Please review.

Comparison is base (8406920) 88.79% compared to head (27e38cb) 95.55%. Report is 16 commits behind head on main.

Files	Patch %	Lines
src/dvclive/fabric.py	82.66%	10 Missing and 3 partials :warning:
tests/frameworks/test_fabric.py	83.33%	6 Missing :warning:
src/dvclive/lightning.py	70.58%	3 Missing and 2 partials :warning:
src/dvclive/utils.py	80.76%	4 Missing and 1 partial :warning:
tests/frameworks/test_lightning.py	94.11%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #781 +/- ## ========================================== + Coverage 88.79% 95.55% +6.75% ========================================== Files 53 55 +2 Lines 3357 3532 +175 Branches 294 314 +20 ========================================== + Hits 2981 3375 +394 + Misses 337 110 -227 - Partials 39 47 +8 ```

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