deps: update dependency com.google.protobuf:protobuf-java-util to v3.15.3 (#437)

[![WhiteSource Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com) This PR contains the following updates: | Package | Change | Age | Adoption | Passing | Confidence | |---|---|---|---|---|---| | [com.google.protobuf:protobuf-java-util](com/google/protobuf/protobuf-java-util) | `3.15.1` -> `3.15.3` | [![age](https://badges.renovateapi.com/packages/maven/com.google.protobuf:protobuf-java-util/3.15.3/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.protobuf:protobuf-java-util/3.15.3/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.protobuf:protobuf-java-util/3.15.3/compatibility-slim/3.15.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.protobuf:protobuf-java-util/3.15.3/confidence-slim/3.15.1)](https://docs.renovatebot.com/merge-confidence/) | --- ### Renovate configuration :date: **Schedule**: At any time (no schedule defined). :vertical_traffic_light: **Automerge**: Disabled by config. Please merge this manually once you are satisfied. :recycle: **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. :no_bell: **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR has been generated by [WhiteSource Renovate](https://renovate.whitesourcesoftware.com). View repository job log [here](https://app.renovatebot.com/dashboard#github/googleapis/java-monitoring).

Author: renovate-bot

samples/install-without-bom/pom.xml

@@ -41,7 +41,7 @@
  <dependency>
  <groupId>com.google.protobuf</groupId>
  <artifactId>protobuf-java-util</artifactId>
- <version>3.15.1</version>
+ <version>3.15.3</version>
  </dependency>
  </dependencies>
 

samples/snapshot/pom.xml

@@ -39,7 +39,7 @@
  <dependency>
  <groupId>com.google.protobuf</groupId>
  <artifactId>protobuf-java-util</artifactId>
- <version>3.15.1</version>
+ <version>3.15.3</version>
  </dependency>
  <dependency>
  <groupId>junit</groupId>