chore(main): release 3.3.1 (#870)

🤖 I have created a release *beep* *boop*
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### [3.3.1](googleapis/java-dlp@v3.3.0...v3.3.1) (2022-04-21)


### Dependencies

* update dependency com.google.cloud:google-cloud-pubsub to v1.116.4 ([#864](googleapis/java-dlp#864)) ([cd2f2c3](googleapis/java-dlp@cd2f2c3))

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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>3.3.1-SNAPSHOT</version>
+      <version>3.3.1</version>
     </dependency>
     <!-- {x-version-update-end} -->