Bump protobuf-java from 2.5.0 to 3.16.3 in /giraph-debugger

Bumps [protobuf-java](https://github.com/protocolbuffers/protobuf) from 2.5.0 to 3.16.3.
- [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/v2.5.0...v3.16.3)

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

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/giraph-debugger/pom.xml b/giraph-debugger/pom.xml
index 628df6a..bf9c970 100644
--- a/giraph-debugger/pom.xml
+++ b/giraph-debugger/pom.xml
@@ -40,7 +40,7 @@
     <project.build.targetJdk>1.7</project.build.targetJdk>
 
     <dep.commons-lang.version>2.4</dep.commons-lang.version>
-    <dep.protobuf.version>2.5.0</dep.protobuf.version>
+    <dep.protobuf.version>3.16.3</dep.protobuf.version>
     <dep.javassist.version>3.18.1-GA</dep.javassist.version>
     <dep.velocity.version>1.7</dep.velocity.version>