Bump protobuf-java from 2.6.1 to 3.21.7 in /java#68

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

75d2dependabot/maven/java/com.google.protobuf-protobuf-java-3.21.7moazreyad/singa:75d2dependabot/maven/java/com.google.protobuf-protobuf-java-3.21.7Copy head branch name to clipboard