Bump mcp from 1.13.1 to 1.23.0 in /src/backend

Bumps [mcp](https://github.com/modelcontextprotocol/python-sdk) from 1.13.1 to 1.23.0.
- [Release notes](https://github.com/modelcontextprotocol/python-sdk/releases)
- [Changelog](https://github.com/modelcontextprotocol/python-sdk/blob/main/RELEASE.md)
- [Commits](modelcontextprotocol/python-sdk@v1.13.1...v1.23.0)

---
updated-dependencies:
- dependency-name: mcp
  dependency-version: 1.23.0
  dependency-type: direct:production
...

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Author: dependabot[bot]

src/backend/pyproject.toml

@@ -31,5 +31,5 @@ dependencies = [
     "uvicorn==0.35.0",
     "pylint-pydantic==0.3.5",
     "pexpect==4.9.0",
-    "mcp==1.13.1"
+    "mcp==1.23.0"
 ]