Bump lz4-java version to 1.7.1

lz4-java v1.7.0 has an issue on older macOS (e.g., v10.12 and v10.13). Since v1.7.1 will be released in the end of next week, we need to upgrade: https://github.com/lz4/lz4-java/issues/156#issuecomment-573063299