Update dependency org.mockito.kotlin:mockito-kotlin to v6.4.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.mockito.kotlin:mockito-kotlin	6.3.0 → 6.4.0

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Release Notes

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

v6.4.0

^{Changelog generated by Shipkit Changelog Gradle Plugin}

6.4.0

• 2026-09-23 - 5 commit(s) by Joshua Selbo, Laura Kassovic, Mirko Alicastro
• Introduce spyObject (#​593)
• Add InOrder verification to MockedStatic (#​592)
• Update README (#​591)
• Add benchmarks comparing mockito-kotlin and MockK (#​590)
• Upgrade project to use Gradle 9.4.1 (#​589)

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