chore(main): release 2.2.0 (#348)

* chore(main): release 2.2.0

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

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

ai-platform/snippets/package.json

@@ -13,7 +13,7 @@
     "test": "mocha --timeout 1200000 test/*.js"
   },
   "dependencies": {
-    "@google-cloud/aiplatform": "^2.1.0",
+    "@google-cloud/aiplatform": "^2.2.0",
     "@google-cloud/storage": "^5.5.0",
     "@google-cloud/bigquery": "^6.0.0"
   },