chore: release 2.3.4 (#523)

🤖 I have created a release \*beep\* \*boop\*
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### [2.3.4](https://www.github.com/googleapis/java-dlp/compare/v2.3.3...v2.3.4) (2021-05-14)


### Dependencies

* update dependency com.google.cloud:google-cloud-pubsub to v1.112.5 ([#522](https://www.github.com/googleapis/java-dlp/issues/522)) ([bf33cd2](https://www.github.com/googleapis/java-dlp/commit/bf33cd208ec34501d915b69ad6976efc6437fc8d))
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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).

dlp/snippets/snapshot/pom.xml

@@ -28,7 +28,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-dlp</artifactId>
-      <version>2.3.4-SNAPSHOT</version>
+      <version>2.3.4</version>
     </dependency>
     <!-- {x-version-update-end} -->