Bump urllib3 from 2.3.0 to 2.6.0 in /ai/gen-ai-agents/custom-rag-agent

Bumps [urllib3](https://github.com/urllib3/urllib3) from 2.3.0 to 2.6.0.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@2.3.0...2.6.0)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-version: 2.6.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

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

@@ -215,7 +215,7 @@ tzdata==2025.1
 unstructured==0.18.2
 unstructured-client==0.37.2
 uri-template==1.3.0
-urllib3==2.3.0
+urllib3==2.6.0
 uvicorn==0.35.0
 watchdog==6.0.0
 wcwidth==0.2.13