add missing @babel/plugin-syntax-import-attributes (#92)

Without this `npm run build` fails. Required for
w3f/Grant-Milestone-Delivery#1270.

Author: Lederstrumpf

packages/mcp/package.json

@@ -36,16 +36,17 @@
   },
   "dependencies": {
     "@modelcontextprotocol/sdk": "^1.6.1",
-    "zod": "^3.22.4",
-    "zod-to-json-schema": "^3.24.3",
     "@polkadot-agent-kit/llm": "workspace:*",
     "@polkadot-agent-kit/sdk": "workspace:*",
-    "dotenv": "^16.5.0"
+    "dotenv": "^16.5.0",
+    "zod": "^3.22.4",
+    "zod-to-json-schema": "^3.24.3"
   },
   "devDependencies": {
-    "@rollup/plugin-typescript": "^12.1.2",
-    "@rollup/plugin-json": "^6.1.0",
+    "@babel/plugin-syntax-import-attributes": "^7.27.1",
     "@rollup/plugin-babel": "^6.0.4",
+    "@rollup/plugin-json": "^6.1.0",
+    "@rollup/plugin-typescript": "^12.1.2",
     "rollup": "^4.37.0",
     "rollup-plugin-dts": "^6.2.1"
   }