Update kotlin monorepo to v2.3.20-RC2

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
org.jetbrains.kotlin.jvm (source)	2.3.20-RC → 2.3.20-RC2
org.jetbrains.kotlin:kotlin-gradle-plugin (source)	2.3.20-RC → 2.3.20-RC2
org.jetbrains.kotlin:kotlin-reflect (source)	2.3.20-RC → 2.3.20-RC2
org.jetbrains.kotlin:kotlin-metadata-jvm (source)	2.3.20-RC → 2.3.20-RC2

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