Bump protobuf-java from 3.4.0 to 3.16.1 in /structure-learn/serialization-learn#31

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dependabot/maven/structure-learn/serialization-learn/com.google.protobuf-protobuf-java-3.16.1ns7381/java_learn:dependabot/maven/structure-learn/serialization-learn/com.google.protobuf-protobuf-java-3.16.1Copy head branch name to clipboard