chore(deps): 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	3.12.2 -> 3.12.4

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Release Notes

mockito/mockito

### [`v3.12.4`](https://togithub.com/mockito/mockito/releases/v3.12.4) [Compare Source](https://togithub.com/mockito/mockito/compare/v3.12.3...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. ### [`v3.12.3`](https://togithub.com/mockito/mockito/releases/v3.12.3) [Compare Source](https://togithub.com/mockito/mockito/compare/v3.12.2...v3.12.3) ^{*Changelog generated by [Shipkit Changelog Gradle Plugin](https://togithub.com/shipkit/shipkit-changelog)*} ##### 3.12.3 - 2021-08-24 - [9 commit(s)](https://togithub.com/mockito/mockito/compare/v3.12.2...v3.12.3) by Rafael Winterhalter - Fix implementation of proxy mock maker for toString and add additional unit tests. [(#​2405)](https://togithub.com/mockito/mockito/pull/2405) - Avoid cache breakage [(#​2402)](https://togithub.com/mockito/mockito/pull/2402) - Add a limited mock maker that is based only on the java.lang.reflect.Proxy utility [(#​2397)](https://togithub.com/mockito/mockito/pull/2397)

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