chore(deps): update dependency com.google.protobuf:protobuf-bom to v3.12.4 (#1587)
chore(deps): update dependency com.google.protobuf:protobuf-bom to v3.12.4 (#1587)


GoogleCloudPlatform/cloud-opensource-java,GoogleCloudPlatform/cloud-opensource-java,GoogleCloudPlatform/cloud-opensource-java