Upgrade to gradio 4
- [ ] upgrade the package in pyproject.toml and requirements.txt
- [ ] remove all the instances of `gr.update()`, which has been deprecated

---

We already did it, but it broke the app

See https://github.com/huggingface/datasets-server/issues/2228 for the issue, and https://github.com/huggingface/datasets-server/pull/2305 for the downgrade.

Upgrade to gradio 4: - [ ] upgrade the package in pyproject.toml and requirements.txt
- [ ] remove all the instances of `gr.update()`, which has been deprecated

---

We already did it, but it broke the app

See https://github.com/huggingface/datasets-server/issues/2228 for the issue, and https://github.com/huggingface/datasets-server/pull/2305 for the downgrade.
