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/74e65db98384a4c182fda2ed81a5a91d667a6d3c/gradio-5.6.0-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@74e65db98384a4c182fda2ed81a5a91d667a6d3c#subdirectory=client/python"

Install Gradio JS Client from this PR

npm install https://gradio-npm-previews.s3.amazonaws.com/74e65db98384a4c182fda2ed81a5a91d667a6d3c/gradio-client-1.8.0.tgz

Use Lite from this PR

<script type="module" src="https://gradio-lite-previews.s3.amazonaws.com/74e65db98384a4c182fda2ed81a5a91d667a6d3c/dist/lite.js""></script>

[gradio-pr-bot]

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This Pull Request does not include changes to any packages.

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