chore: update ai package versions

Author: Cloud Shell

generative-ai/snippets/package.json

@@ -13,8 +13,8 @@
     "test": "c8 mocha -p -j 2 --timeout 2400000 test/*.test.js"
   },
   "dependencies": {
-    "@google-cloud/aiplatform": "^3.0.0",
-    "@google-cloud/vertexai": "github:googleapis/nodejs-vertexai",
+    "@google-cloud/aiplatform": "^3.12.0",
+    "@google-cloud/vertexai": "^0.3.1",
     "axios": "^1.6.2",
     "supertest": "^6.3.3"
   },