Update kotlin monorepo to v2.3.20-RC2

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
org.jetbrains.kotlin:kotlin-test-junit (source)	2.3.20-RC → 2.3.20-RC2
org.jetbrains.kotlin:kotlin-gradle-plugin (source)	2.3.20-RC → 2.3.20-RC2

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Release Notes

JetBrains/kotlin (org.jetbrains.kotlin:kotlin-test-junit)

v2.3.20-RC2: Kotlin 2.3.20-RC2

Changelog

Compiler

• KT-84620 Incorrect optimization of property delegation
• KT-81974 Do not eagerly initialize reflection for KProperty objects for delegated properties

JVM. Reflection

• KT-84600 Performance regression around Kotlin properties JVM reflection during instantiation

Tools. Build Tools API

• KT-84577 BTA: API 2.3.20 incompatible with compiler 2.3.10

Tools. Compiler plugins. Compose

• KT-84218 [2.3.20-Beta1] "IllegalStateException: no implementation for FUN MISSING_DECLARATION" during bitcode lowering

Tools. Gradle

• KT-84152 Memory Leak and OOM Errors in Kotlin Gradle Plugin 2.3.20-Beta2 with in-process execution mode

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