Bump fastmcp from 2.9.2 to 2.13.0 in /ai/gen-ai-agents/custom-rag-agent

Bumps [fastmcp](https://github.com/jlowin/fastmcp) from 2.9.2 to 2.13.0.
- [Release notes](https://github.com/jlowin/fastmcp/releases)
- [Changelog](https://github.com/jlowin/fastmcp/blob/main/docs/changelog.mdx)
- [Commits](jlowin/fastmcp@v2.9.2...v2.13.0)

---
updated-dependencies:
- dependency-name: fastmcp
  dependency-version: 2.13.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

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

@@ -43,7 +43,7 @@ executing==2.2.0
 faiss-cpu==1.11.0.post1
 fastapi==0.115.14
 fastjsonschema==2.21.1
-fastmcp==2.9.2
+fastmcp==2.13.0
 filetype==1.2.0
 flatbuffers==25.2.10
 fonttools==4.56.0