build(deps): bump protobuf-java in /apps/dgiot_dlink/priv/example/java

Bumps [protobuf-java](https://github.com/protocolbuffers/protobuf) from 3.19.4 to 3.19.6.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/generate_changelog.py)
- [Commits](https://github.com/protocolbuffers/protobuf/compare/v3.19.4...v3.19.6

)

---
updated-dependencies:
- dependency-name: com.google.protobuf:protobuf-java
  dependency-type: direct:production
...
Signed-off-by: dependabot[bot] <support@github.com>

apps/dgiot_dlink/priv/example/java/pom.xml

@@ -17,7 +17,7 @@
 
     <properties>
         <java.version>1.8</java.version>
-        <protobuf.version>3.19.4</protobuf.version>
+        <protobuf.version>3.19.6</protobuf.version>
         <grpc.version>1.26.0</grpc.version>
     </properties>
     <dependencies>