chore: release 2.3.0 (#308)

🤖 I have created a release \*beep\* \*boop\*
---
## [2.3.0](https://www.github.com/googleapis/nodejs-datalabeling/compare/v2.2.7...v2.3.0) (2021-08-23)


### Features

* turns on self-signed JWT feature flag ([#307](https://www.github.com/googleapis/nodejs-datalabeling/issues/307)) ([adbe0cd](https://www.github.com/googleapis/nodejs-datalabeling/commit/adbe0cdef6538df9055a5e5039161e5a680cb336))
---


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": "^2.2.7"
+    "@google-cloud/datalabeling": "^2.3.0"
   },
   "devDependencies": {
     "chai": "^4.2.0",