chore(main): release 1.6.1 (#158)

🤖 I have created a release *beep* *boop*
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### [1.6.1](googleapis/nodejs-retail@v1.6.0...v1.6.1) (2022-03-15)


### Bug Fixes

* remove gcloud_project env variable ([#156](googleapis/nodejs-retail#156)) ([16cefb4](googleapis/nodejs-retail@16cefb4))

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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]

retail/package.json

@@ -13,7 +13,7 @@
     "test": "c8 mocha"
   },
   "dependencies": {
-    "@google-cloud/retail": "^1.6.0",
+    "@google-cloud/retail": "^1.6.1",
     "@google-cloud/bigquery": "^5.9.2",
     "@google-cloud/storage": "^5.16.1"
   },