chore(main): release 1.15.0 (#263)

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

Author: release-please[bot]

ai-platform/snippets/package.json

@@ -13,7 +13,7 @@
     "test": "mocha --timeout 1200000 test/*.js"
   },
   "dependencies": {
-    "@google-cloud/aiplatform": "^1.14.0",
+    "@google-cloud/aiplatform": "^1.15.0",
     "@google-cloud/storage": "^5.5.0"
   },
   "devDependencies": {