Update dependency org.mockito:mockito-core to v3.7.15

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.mockito:mockito-core	3.7.13 -> 3.7.15

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Release Notes

mockito/mockito

v3.7.15

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3.7.15

• 2021-02-05 - 2 commit(s) by dependabot[bot]
• Bump versions.junitJupiter from 5.7.0 to 5.7.1 (#​2199)
• Bump junit-platform-launcher from 1.7.0 to 1.7.1 (#​2198)

v3.7.14

Compare Source

^{Changelog generated by Shipkit Changelog Gradle Plugin}

3.7.14

• 2021-02-05 - 1 commit(s) by dependabot[bot]
• Bump versions.junitJupiter from 5.7.0 to 5.7.1 (#​2199)

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