build(deps): bump protobuf from 3.15.7 to 3.16.0 in /examples/grpc-bridge/client#39

dependabot[bot] wants to merge 1 commit intomasterwangfakang/envoy:masterfrom

dependabot/pip/examples/grpc-bridge/client/protobuf-3.16.0wangfakang/envoy:dependabot/pip/examples/grpc-bridge/client/protobuf-3.16.0Copy head branch name to clipboard