Bump @modelcontextprotocol/sdk in /packages/gitbook

Bumps [@modelcontextprotocol/sdk](https://github.com/modelcontextprotocol/typescript-sdk) from 1.17.5 to 1.26.0.
- [Release notes](https://github.com/modelcontextprotocol/typescript-sdk/releases)
- [Commits](modelcontextprotocol/typescript-sdk@1.17.5...v1.26.0)

---
updated-dependencies:
- dependency-name: "@modelcontextprotocol/sdk"
  dependency-version: 1.26.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

packages/gitbook/package.json

@@ -18,7 +18,7 @@
         "@gitbook/react-math": "workspace:*",
         "@gitbook/react-openapi": "workspace:*",
         "@mermaid-js/mermaid-zenuml": "^0.2.2",
-        "@modelcontextprotocol/sdk": "1.17.5",
+        "@modelcontextprotocol/sdk": "1.26.0",
         "@opennextjs/aws": "^3.8.5",
         "@opennextjs/cloudflare": "^1.14.4",
         "@radix-ui/react-checkbox": "^1.0.4",