chore: release 1.9.0 (#171)

🤖 I have created a release \*beep\* \*boop\*
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## [1.9.0](https://www.github.com/googleapis/nodejs-ai-platform/compare/v1.8.0...v1.9.0) (2021-07-15)


### Features

* Adds additional_experiments field to AutoMlTablesInputs ([#170](https://www.github.com/googleapis/nodejs-ai-platform/issues/170)) ([4a0a502](https://www.github.com/googleapis/nodejs-ai-platform/commit/4a0a502bb1a01efb701202098524f0020d1faad4))
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This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).

Author: release-please[bot]

ai-platform/snippets/package.json

@@ -13,7 +13,7 @@
     "test": "mocha --timeout 1200000 test/*.js"
   },
   "dependencies": {
-    "@google-cloud/aiplatform": "^1.8.0",
+    "@google-cloud/aiplatform": "^1.9.0",
     "@google-cloud/storage": "^5.5.0"
   },
   "devDependencies": {