Bump transformers from 4.31.0 to 4.36.0 in /backend

Bumps [transformers](https://github.com/huggingface/transformers) from 4.31.0 to 4.36.0.
- [Release notes](https://github.com/huggingface/transformers/releases)
- [Commits](huggingface/transformers@v4.31.0...v4.36.0)

---
updated-dependencies:
- dependency-name: transformers
  dependency-type: direct:production
...

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