Bump gradio

Bumps [gradio](https://github.com/gradio-app/gradio) from 4.16.0 to 4.19.2.
- [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/compare/gradio@4.16.0...gradio@4.19.2)

---
updated-dependencies:
- dependency-name: gradio
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

recipes/llama_api_providers/OctoAI_API_examples/RAG_Chatbot_example/requirements.txt

@@ -1,4 +1,4 @@
-gradio==4.16.0
+gradio==4.19.2
 pypdf==4.0.0
 langchain==0.1.19
 sentence-transformers==2.2.2