chore(deps): bump transformers from 4.48.3 to 4.56.2 in /backend/python/coqui (#6330)

chore(deps): bump transformers in /backend/python/coqui

Bumps [transformers](https://github.com/huggingface/transformers) from 4.48.3 to 4.56.2.
- [Release notes](https://github.com/huggingface/transformers/releases)
- [Commits](https://github.com/huggingface/transformers/compare/v4.48.3...v4.56.2)

---
updated-dependencies:
- dependency-name: transformers
  dependency-version: 4.56.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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