Bump protobuf-java from 2.6.1 to 3.15.7 in /java#36

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mastermoazreyad/singa:masterfrom

2443dependabot/maven/java/com.google.protobuf-protobuf-java-3.15.7moazreyad/singa:2443dependabot/maven/java/com.google.protobuf-protobuf-java-3.15.7Copy head branch name to clipboard