chore(deps): bump @modelcontextprotocol/sdk in /packages/opencode (#139)

Bumps [@modelcontextprotocol/sdk](https://github.com/modelcontextprotocol/typescript-sdk) from 1.25.2 to 1.26.0.
- [Release notes](https://github.com/modelcontextprotocol/typescript-sdk/releases)
- [Commits](modelcontextprotocol/typescript-sdk@v1.25.2...v1.26.0)

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

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Author: dependabot[bot]

packages/opencode/package.json

@@ -75,7 +75,7 @@
     "@gitlab/opencode-gitlab-auth": "1.3.3",
     "@hono/standard-validator": "0.1.5",
     "@hono/zod-validator": "catalog:",
-    "@modelcontextprotocol/sdk": "1.25.2",
+    "@modelcontextprotocol/sdk": "1.26.0",
     "@octokit/graphql": "9.0.2",
     "@octokit/rest": "catalog:",
     "@openauthjs/openauth": "catalog:",