chore: release 2.3.1 (#473)

🤖 I have created a release \*beep\* \*boop\*
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### [2.3.1](https://www.github.com/googleapis/java-dlp/compare/v2.3.0...v2.3.1) (2021-04-12)


### Documentation

* version update ([#472](https://www.github.com/googleapis/java-dlp/issues/472)) ([f3186cd](https://www.github.com/googleapis/java-dlp/commit/f3186cdb10f191985bca4dcc2c3176537c3b2aa0))


### Dependencies

* update dependency com.google.cloud:google-cloud-pubsub to v1.112.0 ([#467](https://www.github.com/googleapis/java-dlp/issues/467)) ([39636a5](https://www.github.com/googleapis/java-dlp/commit/39636a574c585b145cc509b2f93fb1187a218941))
* update dependency com.google.cloud:google-cloud-shared-dependencies to v0.21.0 ([#483](https://www.github.com/googleapis/java-dlp/issues/483)) ([ed17f67](https://www.github.com/googleapis/java-dlp/commit/ed17f67e0b20dcdbefd99dcfc0241b0a3a84bcc0))
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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/snippets/snapshot/pom.xml

@@ -28,7 +28,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-dlp</artifactId>
-      <version>2.3.1-SNAPSHOT</version>
+      <version>2.3.1</version>
     </dependency>
     <!-- {x-version-update-end} -->