Bump lxml in /ai/gen-ai-agents/custom-rag-agent/files

Bumps [lxml](https://github.com/lxml/lxml) from 6.0.0 to 6.1.0.
- [Release notes](https://github.com/lxml/lxml/releases)
- [Changelog](https://github.com/lxml/lxml/blob/master/CHANGES.txt)
- [Commits](lxml/lxml@lxml-6.0.0...lxml-6.1.0)

---
updated-dependencies:
- dependency-name: lxml
  dependency-version: 6.1.0
  dependency-type: direct:production
...

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Author: dependabot[bot]

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

@@ -98,7 +98,7 @@ langgraph-checkpoint==3.0.0
 langgraph-prebuilt==0.5.1
 langgraph-sdk==0.1.55
 langsmith==0.4.4
-lxml==6.0.0
+lxml==6.1.0
 markdown-it-py==3.0.0
 MarkupSafe==3.0.2
 marshmallow==3.26.1