As per latest documentation of version 4.2.0 it looks like mockito community has come up with mockito-inline for some experimental features like mocking final classes and methods, mocking static methods etc. So once they get feedback from community they will merge those changes in mockito-core and abolished mockito-inline. Eventually it will be mockito-core only.
https://javadoc.io/doc/org.mockito/mockito-core/latest/org/mockito/Mockito.html#mockito-inline
https://javadoc.io/doc/org.mockito/mockito-core/latest/org/mockito/Mockito.html#39