Update kotlin monorepo to v2.4.21

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
org.jetbrains.kotlin.plugin.compose (source)	2.4.20 → 2.4.21
org.jetbrains.kotlin:kotlin-metadata-jvm (source)	2.4.20 → 2.4.21
org.jetbrains.kotlin.plugin.serialization (source)	2.4.20 → 2.4.21
org.jetbrains.kotlin.android (source)	2.4.20 → 2.4.21

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