Bump starlette in /ai/gen-ai-agents/custom-rag-agent

Bumps [starlette](https://github.com/Kludex/starlette) from 0.47.2 to 0.49.1.
- [Release notes](https://github.com/Kludex/starlette/releases)
- [Changelog](https://github.com/Kludex/starlette/blob/main/docs/release-notes.md)
- [Commits](Kludex/starlette@0.47.2...0.49.1)

---
updated-dependencies:
- dependency-name: starlette
  dependency-version: 0.49.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

ai/gen-ai-agents/custom-rag-agent/requirements.txt

@@ -192,7 +192,7 @@ soupsieve==2.6
 SQLAlchemy==2.0.38
 sse-starlette==2.3.6
 stack-data==0.6.3
-starlette==0.47.2
+starlette==0.49.1
 streamlit==1.43.0
 sympy==1.14.0
 tabulate==0.9.0