Update Transformers agent demo

[freddyaboulton]

Description

The stream to gradio logic has been merged to transformers.

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Tests

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[gradio-pr-bot]

🪼 branch checks and previews

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Install Gradio from this PR

pip install https://gradio-pypi-previews.s3.amazonaws.com/fd98395bd92df940d8ddca11cee12cded0584d32/gradio-5.4.0-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@fd98395bd92df940d8ddca11cee12cded0584d32#subdirectory=client/python"

Install Gradio JS Client from this PR

npm install https://gradio-npm-previews.s3.amazonaws.com/fd98395bd92df940d8ddca11cee12cded0584d32/gradio-client-1.7.1.tgz

Use Lite from this PR

<script type="module" src="https://gradio-lite-previews.s3.amazonaws.com/fd98395bd92df940d8ddca11cee12cded0584d32/dist/lite.js""></script>

[gradio-pr-bot]

🦄 no changes detected

This Pull Request does not include changes to any packages.

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