Bump mcp from 1.9.2 to 1.12.3

Bumps [mcp](https://github.com/modelcontextprotocol/python-sdk) from 1.9.2 to 1.12.3.
- [Release notes](https://github.com/modelcontextprotocol/python-sdk/releases)
- [Changelog](https://github.com/modelcontextprotocol/python-sdk/blob/main/RELEASE.md)
- [Commits](modelcontextprotocol/python-sdk@v1.9.2...v1.12.3)

---
updated-dependencies:
- dependency-name: mcp
  dependency-version: 1.12.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pyproject.toml

@@ -8,7 +8,7 @@ dependencies = [
     "fastapi==0.115.12",
     "uvicorn==0.34.3",
     "fastapi-mcp==0.3.4",
-    "mcp==1.9.2",
+    "mcp==1.12.3",
     "pyspark==3.5.5",
     "delta-spark==3.3.2",
     "aiohttp==3.12.8",