chore: release 2.2.6 (#400)

🤖 I have created a release \*beep\* \*boop\* 
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### [2.2.6](https://www.github.com/googleapis/java-dlp/compare/v2.2.5...v2.2.6) (2021-01-14)


### Dependencies

* update dependency com.google.cloud:google-cloud-shared-dependencies to v0.18.0 ([#399](https://www.github.com/googleapis/java-dlp/issues/399)) ([9761941](https://www.github.com/googleapis/java-dlp/commit/97619410a08a2b3cecc38f2aa650164ef6f4a696))
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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>2.2.6-SNAPSHOT</version>
+      <version>2.2.6</version>
     </dependency>
     <!-- {x-version-update-end} -->