Update Kover to 0.7.6

[Jolanrensen]

The project uses org.jetbrains.kotlinx.kover:org.jetbrains.kotlinx.kover.gradle.plugin:0.6.1 but it requires more work to update it to 0.7.0: https://github.com/Kotlin/kotlinx-kover/blob/v0.7.0/docs/gradle-plugin/migrations/migration-to-0.7.0.md

[fb64]

I think this one can be closed