Bump mockito-core from 2.25.1 to 2.26.0

Bumps [mockito-core](https://github.com/mockito/mockito) from 2.25.1 to 2.26.0.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](https://github.com/mockito/mockito/compare/v2.25.1...v2.26.0

)

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