Adopt Blake2_128Concat instead of Blake2_128
See forum post for description: https://forum.duniter.org/t/passer-de-blake2-128-a-blake2-128concat-pour-les-maps/11447
See forum post for description: https://forum.duniter.org/t/passer-de-blake2-128-a-blake2-128concat-pour-les-maps/11447