chore: release 2.2.4 (#293)

🤖 I have created a release \*beep\* \*boop\*
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### [2.2.4](https://www.github.com/googleapis/nodejs-datalabeling/compare/v2.2.3...v2.2.4) (2021-06-30)


### Bug Fixes

* **deps:** google-gax v2.17.0 with mTLS ([#291](https://www.github.com/googleapis/nodejs-datalabeling/issues/291)) ([ba455a8](https://www.github.com/googleapis/nodejs-datalabeling/commit/ba455a8d574f9bb87c9f7531ba56e199ad0dc8be))
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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]

datalabeling/package.json

@@ -14,7 +14,7 @@
     "test": "mocha --timeout 600000"
   },
   "dependencies": {
-    "@google-cloud/datalabeling": "^2.2.3"
+    "@google-cloud/datalabeling": "^2.2.4"
   },
   "devDependencies": {
     "chai": "^4.2.0",