build(deps): bump mcp from 1.6.0 to 1.12.2

Bumps [mcp](https://github.com/modelcontextprotocol/python-sdk) from 1.6.0 to 1.12.2.
- [Release notes](https://github.com/modelcontextprotocol/python-sdk/releases)
- [Changelog](https://github.com/modelcontextprotocol/python-sdk/blob/main/RELEASE.md)
- [Commits](modelcontextprotocol/python-sdk@v1.6.0...v1.12.2)

---
updated-dependencies:
- dependency-name: mcp
  dependency-version: 1.12.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]