chore: release 2.2.3 (#378)

🤖 I have created a release \*beep\* \*boop\*
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### [2.2.3](https://www.github.com/googleapis/nodejs-scheduler/compare/v2.2.2...v2.2.3) (2021-06-22)


### Bug Fixes

* make request optional in all cases ([#377](https://www.github.com/googleapis/nodejs-scheduler/issues/377)) ([4e09949](https://www.github.com/googleapis/nodejs-scheduler/commit/4e0994968fa9fb08f5e7a5f8e9f7cbe96b62e4bf))
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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]

scheduler/package.json

@@ -14,7 +14,7 @@
     "test": "mocha --timeout 10000 --exit"
   },
   "dependencies": {
-    "@google-cloud/scheduler": "^2.2.2",
+    "@google-cloud/scheduler": "^2.2.3",
     "body-parser": "^1.18.3",
     "express": "^4.16.4"
   },