Bump protobuf-java from 2.5.0 to 3.16.3 in /tajo-project

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/tajo-project/pom.xml b/tajo-project/pom.xml
index 59628a9..ee3e21e 100644
--- a/tajo-project/pom.xml
+++ b/tajo-project/pom.xml
@@ -37,7 +37,7 @@
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
     <tajo.version>0.8.0-SNAPSHOT</tajo.version>
     <hadoop.version>2.2.0</hadoop.version>
-    <protobuf.version>2.5.0</protobuf.version>
+    <protobuf.version>3.16.3</protobuf.version>
     <tajo.root>${project.parent.relativePath}/..</tajo.root>
   </properties>