Bump protobuf-java from 2.6.1 to 3.13.0 in /java#19

dependabot[bot] wants to merge 1 commit intomastermoazreyad/singa:masterfrom

2f58dependabot/maven/java/com.google.protobuf-protobuf-java-3.13.0moazreyad/singa:2f58dependabot/maven/java/com.google.protobuf-protobuf-java-3.13.0Copy head branch name to clipboard