chore(deps): bump @modelcontextprotocol/sdk from 1.12.1 to 1.20.0

Bumps [@modelcontextprotocol/sdk](https://github.com/modelcontextprotocol/typescript-sdk) from 1.12.1 to 1.20.0.
- [Release notes](https://github.com/modelcontextprotocol/typescript-sdk/releases)
- [Commits](modelcontextprotocol/typescript-sdk@1.12.1...1.20.0)

---
updated-dependencies:
- dependency-name: "@modelcontextprotocol/sdk"
  dependency-version: 1.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package.json

@@ -98,7 +98,7 @@
     "@langchain/anthropic": "^0.3.26",
     "@langchain/core": "^0.3.72",
     "@langchain/openai": "^0.6.9",
-    "@modelcontextprotocol/sdk": "1.12.1",
+    "@modelcontextprotocol/sdk": "1.20.0",
     "@scarf/scarf": "^1.4.0",
     "ai": "^4.3.19",
     "dotenv": "^16.5.0",