fix(mcpb): pin @anthropic-ai/mcpb version

Author: stainless-app[bot]

packages/mcp-server/package.json

@@ -48,7 +48,7 @@
     "mcp-server": "dist/index.js"
   },
   "devDependencies": {
-    "@anthropic-ai/mcpb": "^1.1.0",
+    "@anthropic-ai/mcpb": "1.1.0",
     "@types/cors": "^2.8.19",
     "@types/express": "^5.0.3",
     "@types/jest": "^29.4.0",