chore: release 1.7.2 (#153)

🤖 I have created a release \*beep\* \*boop\*
---
### [1.7.2](https://www.github.com/googleapis/nodejs-ai-platform/compare/v1.7.1...v1.7.2) (2021-06-22)


### Bug Fixes

* make request optional in all cases ([#152](https://www.github.com/googleapis/nodejs-ai-platform/issues/152)) ([96b9fba](https://www.github.com/googleapis/nodejs-ai-platform/commit/96b9fba9b66807ac5ea2c5826d5fd3f4e895dc9e))
---


This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).

ai-platform/snippets/package.json

@@ -13,7 +13,7 @@
     "test": "mocha --timeout 1200000 test/*.js"
   },
   "dependencies": {
-    "@google-cloud/aiplatform": "^1.7.1",
+    "@google-cloud/aiplatform": "^1.7.2",
     "@google-cloud/storage": "^5.5.0"
   },
   "devDependencies": {