Bump transformers from 4.28.1 to 4.30.0 in /demos/palm/python/docs-agent

Bumps [transformers](https://github.com/huggingface/transformers) from 4.28.1 to 4.30.0.
- [Release notes](https://github.com/huggingface/transformers/releases)
- [Commits](huggingface/transformers@v4.28.1...v4.30.0)

---
updated-dependencies:
- dependency-name: transformers
  dependency-type: indirect
...

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