[DO NOT MERGE] Testing saftensors 0.6.0

[Narsil]

What does this PR do?

Fixes # (issue)

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[ydshieh]

run-slow: bert, gpt2, vit, whisper, llama, t5, siglip, bart, clip

[github-actions]

This comment contains run-slow, running the specified jobs:

models: ['models/bart', 'models/bert', 'models/clip', 'models/gpt2', 'models/llama', 'models/siglip', 'models/t5', 'models/vit', 'models/whisper']
quantizations: [] ...

[ydshieh]

There are several failures which seems to new from this PR

bert

https://github.com/huggingface/transformers/actions/runs/15680114584/job/44169418138

vit

https://github.com/huggingface/transformers/actions/runs/15680114584/job/44169418172

actually, all the models I triggered have this failures

[Narsil]

run-slow: bert, gpt2, vit, whisper, llama, t5, siglip, bart, clip

[ydshieh]

run-slow: bert, gpt2, vit, whisper, llama, t5, siglip, bart, clip

[github-actions]

This comment contains run-slow, running the specified jobs:

models: ['models/bart', 'models/bert', 'models/clip', 'models/gpt2', 'models/llama', 'models/siglip', 'models/t5', 'models/vit', 'models/whisper']
quantizations: [] ...

[ydshieh]

the failing tests match the results of main's results, so good