Cherry-pick: Bump mockito-core from 3.2.4 to 3.3.0 (#247)
Cherry-pick: Bump mockito-core from 3.2.4 to 3.3.0 (#247)

Signed-off-by: Sjoerd Talsma <1dafb4c4a7acdc6e1eca32ff35fda03e0e9cd976@talsma-ict.nl>

talsma-ict/umldoclet,talsma-ict/umldoclet