Update Kotlin and KSP to v0.8.1

[renovate]

Kotlin and KSP need to be updated together since each KSP version is tied to a Kotlin version. This PR will aggregate their updates. Once checks are passing because compatible versions are in use, this PR can be merged.

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.jetbrains.kotlinx.kover	0.8.0 -> 0.8.1
org.jetbrains.kotlinx:kover-gradle-plugin	0.8.0 -> 0.8.1

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Release Notes

Kotlin/kotlinx-kover (org.jetbrains.kotlinx.kover)

v0.8.1

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Kover Gradle Plugin

Features

• #600 Apply recommendations for improving DSL
• Added DSL to copy one report variant

Bugfixes

• #610 Fixed KoverCriticalException with a certain order of applying of plugins

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