chore(deps): update dependency org.mockito.kotlin:mockito-kotlin to v6.3.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Reproducible
org.mockito.kotlin:mockito-kotlin	6.2.3 → 6.3.0

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Release Notes

mockito/mockito-kotlin (org.mockito.kotlin:mockito-kotlin)

v6.3.0

^{Changelog generated by Shipkit Changelog Gradle Plugin}

6.3.0

• 2026-03-19 - 2 commit(s) by Joshua Selbo
• Add first-class support for mocking object singletons (#​587)
• Add helper to mock module-level extension functions (#​586)

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