Update dependency org.mockito:mockito-core to v3.12.4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.mockito:mockito-core	3.12.3 -> 3.12.4

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Release Notes

mockito/mockito

### [`v3.12.4`](https://togithub.com/mockito/mockito/releases/v3.12.4) ^{*Changelog generated by [Shipkit Changelog Gradle Plugin](https://togithub.com/shipkit/shipkit-changelog)*} ##### 3.12.4 - 2021-08-25 - [1 commit(s)](https://togithub.com/mockito/mockito/compare/v3.12.3...v3.12.4) by Rafael Winterhalter - No notable improvements. No pull requests (issues) were referenced from commits.

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