chore: release 3.0.6 (#671)

🤖 I have created a release \*beep\* \*boop\*
---
### [3.0.6](https://www.github.com/googleapis/java-dlp/compare/v3.0.5...v3.0.6) (2021-09-20)


### Dependencies

* update dependency com.google.cloud:google-cloud-pubsub to v1.114.4 ([#669](https://www.github.com/googleapis/java-dlp/issues/669)) ([0cbb682](https://www.github.com/googleapis/java-dlp/commit/0cbb6827aa54378c6f3a797f94e7d77353bb324a))
---


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>3.0.6-SNAPSHOT</version>
+      <version>3.0.6</version>
     </dependency>
     <!-- {x-version-update-end} -->