Bump protobuf-java from 3.7.1 to 3.16.3 in /java/flight/flight-core#2

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dependabot/maven/java/flight/flight-core/com.google.protobuf-protobuf-java-3.16.3GlobalWebIndex/arrow:dependabot/maven/java/flight/flight-core/com.google.protobuf-protobuf-java-3.16.3Copy head branch name to clipboard