Bump @modelcontextprotocol/sdk from 1.18.0 to 1.19.1

Bumps [@modelcontextprotocol/sdk](https://github.com/modelcontextprotocol/typescript-sdk) from 1.18.0 to 1.19.1.
- [Release notes](https://github.com/modelcontextprotocol/typescript-sdk/releases)
- [Commits](https://github.com/modelcontextprotocol/typescript-sdk/commits)

---
updated-dependencies:
- dependency-name: "@modelcontextprotocol/sdk"
  dependency-version: 1.19.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]