build(deps-dev): bump mockito-core from 3.6.0 to 3.6.28
build(deps-dev): bump mockito-core from 3.6.0 to 3.6.28

Bumps [mockito-core](https://github.com/mockito/mockito) from 3.6.0 to 3.6.28.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](https://github.com/mockito/mockito/compare/v3.6.0...v3.6.28)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
killbill/killbill-oss-parent