chore: release 3.0.4 (#662)

🤖 I have created a release \*beep\* \*boop\*
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### [3.0.4](https://www.github.com/googleapis/java-dlp/compare/v3.0.3...v3.0.4) (2021-09-13)


### Dependencies

* update dependency com.google.cloud:google-cloud-pubsub to v1.114.3 ([#653](https://www.github.com/googleapis/java-dlp/issues/653)) ([1953599](https://www.github.com/googleapis/java-dlp/commit/19535990c1b46bda86b579e11b0341fbdcb8b62b))
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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>3.0.4-SNAPSHOT</version>
+      <version>3.0.4</version>
     </dependency>
     <!-- {x-version-update-end} -->