chore: release 2.4.2 (#553)

🤖 I have created a release \*beep\* \*boop\*
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### [2.4.2](https://www.github.com/googleapis/java-dlp/compare/v2.4.1...v2.4.2) (2021-06-04)


### Dependencies

* update dependency com.google.cloud:google-cloud-shared-dependencies to v1.3.0 ([#551](https://www.github.com/googleapis/java-dlp/issues/551)) ([a80ff84](https://www.github.com/googleapis/java-dlp/commit/a80ff845bd95abb4e7b9f9d5bd85921e97b3a0c0))
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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>2.4.2-SNAPSHOT</version>
+      <version>2.4.2</version>
     </dependency>
     <!-- {x-version-update-end} -->