fix a2a-middleware peerdep (#549)

Author: maxkorp

typescript-sdk/integrations/a2a-middleware/package.json

@@ -20,11 +20,11 @@
   },
   "dependencies": {
     "@a2a-js/sdk": "^0.2.2",
-    "@ag-ui/client": ">=0.0.40",
     "ai": "^4.3.16",
     "zod": "^3.22.4"
   },
   "peerDependencies": {
+    "@ag-ui/client": ">=0.0.40",
     "rxjs": "7.8.1"
   },
   "devDependencies": {