Bump protobuf from 3.10.0 to 3.15.0 in /backend#162

dependabot[bot] wants to merge 1 commit intomasterbattlecode/battlehack20:masterfrom

dependabot/pip/backend/protobuf-3.15.0battlecode/battlehack20:dependabot/pip/backend/protobuf-3.15.0Copy head branch name to clipboard