feat: transformers v5

[dolfim-ibm]

Checklist:

• Documentation has been updated, if necessary.
• Examples have been added, if necessary.
• Tests have been added, if necessary.

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[adithya-s-k]

Hi! We're using docling-ibm-models as a dependency in OmniDocs and are currently blocked from upgrading to transformers v5 because of the transformers<5.0.0 pin. Would love to see this merged — any timeline for when it might land? Thanks!

[PeterStaar-IBM]

superseded by #151