Add JSON export button for line plots and upgrade gradio dependency

[JamshedAli18]

• Added export functionality to download line plot data as JSON
• Each plot now has an 'Export as JSON' button below it
• JSON format includes x-axis name, y-axis name, and data for each run
• Fixes enhancement request to allow exporting line plots as JSON data

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Short description

This PR This PR adds the ability to export line plot data as JSON. Each plot now has an "Export as JSON" button that downloads the plot data in a structured format containing the x-axis name, y-axis name, and values for each run.

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Type of Change

• Bug fix
• New feature (non-breaking)
• New feature (breaking change)
• Documentation update
• Test improvements

Related Issues

If this PR closes an issue, please link it below:

Closes: #368
Closes: #385

Testing and linting

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[abidlabs]

Thanks @JamshedAli18 for the PR. While this approach works, there's a cleaner UI using https://www.gradio.app/main/guides/custom-buttons. The Gradio team is still adding custom button support for gr.LinePlot, once this has been done, I'll reopen this PR and we can make the change.

[gradio-pr-bot]

🪼 branch checks and previews

•	Name	Status	URL
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[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
trackio	patch

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• Add JSON export button for line plots and upgrade gradio dependency

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✅ Changeset approved by @abidlabs

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[HuggingFaceDocBuilderDev]

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[abidlabs]

Going to merge this in, thanks @JamshedAli18!