chore(deps): bump gradio from 5.50.0 to 6.8.0 (#386)

Bumps [gradio](https://github.com/gradio-app/gradio) from 5.50.0 to 6.8.0.
- [Release notes](https://github.com/gradio-app/gradio/releases)
- [Changelog](https://github.com/gradio-app/gradio/blob/main/CHANGELOG.md)
- [Commits](https://github.com/gradio-app/gradio/commits/gradio@6.8.0)

---
updated-dependencies:
- dependency-name: gradio
  dependency-version: 6.8.0
  dependency-type: indirect
...

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Author: dependabot[bot]