[pom] Update to mockito 2.2.21
[pom] Update to mockito 2.2.21

Waffle/waffle,hazendaz/waffle,AriSuutariST/waffle,hazendaz/waffle,AriSuutariST/waffle,hazendaz/waffle,dblock/waffle,AriSuutariST/waffle,AriSuutariST/waffle,Waffle/waffle,Waffle/waffle,dblock/waffle,dblock/waffle,dblock/waffle