Bump protobuf-java from 2.4.1 to 3.16.1

Bumps [protobuf-java](https://github.com/protocolbuffers/protobuf) from 2.4.1 to 3.16.1.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/master/generate_changelog.py)
- [Commits](protocolbuffers/protobuf@v2.4.1...v3.16.1)

---
updated-dependencies:
- dependency-name: com.google.protobuf:protobuf-java
  dependency-type: direct:production
...

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Author: dependabot[bot]

pom.xml

@@ -41,7 +41,7 @@
     <dependency> 
       <groupId>com.google.protobuf</groupId>  
       <artifactId>protobuf-java</artifactId>  
-      <version>2.4.1</version> 
+      <version>3.16.1</version> 
     </dependency>  
     <dependency> 
       <groupId>org.apache.httpcomponents</groupId>