Build(deps): update @modelcontextprotocol/sdk requirement in /client

Updates the requirements on [@modelcontextprotocol/sdk](https://github.com/modelcontextprotocol/typescript-sdk) to permit the latest version.
- [Release notes](https://github.com/modelcontextprotocol/typescript-sdk/releases)
- [Commits](modelcontextprotocol/typescript-sdk@v1.27.1...v1.28.0)

---
updated-dependencies:
- dependency-name: "@modelcontextprotocol/sdk"
  dependency-version: 1.28.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

client/package.json

@@ -27,7 +27,7 @@
     "npm": ">=11.6.2"
   },
   "dependencies": {
-    "@modelcontextprotocol/sdk": "^1.27.1",
+    "@modelcontextprotocol/sdk": "^1.28.0",
     "dotenv": "^17.3.1",
     "js-yaml": "^4.1.1"
   },