chore: release 3.1.5 (#633)

🤖 I have created a release \*beep\* \*boop\*
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### [3.1.5](https://www.github.com/googleapis/nodejs-dlp/compare/v3.1.4...v3.1.5) (2021-07-12)


### Bug Fixes

* **deps:** google-gax v2.17.1 ([#632](https://www.github.com/googleapis/nodejs-dlp/issues/632)) ([78e120a](https://www.github.com/googleapis/nodejs-dlp/commit/78e120a74629cb3b165d4bcc3a3a880bad00caf6))
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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]

dlp/package.json

@@ -15,7 +15,7 @@
     "test": "mocha system-test/*.test.js --timeout=600000"
   },
   "dependencies": {
-    "@google-cloud/dlp": "^3.1.4",
+    "@google-cloud/dlp": "^3.1.5",
     "@google-cloud/pubsub": "^2.0.0",
     "mime": "^2.3.1",
     "yargs": "^16.0.0"