Update 2.1.20-RC2

https://kotlinlang.org/docs/whatsnew-eap.html#kotlin-multiplatform-new-dsl-to-replace-gradle-s-application-plugin

Author: Goooler

gradle/libs.versions.toml

@@ -1,5 +1,5 @@
 [versions]
-kotlin = "2.1.10"
+kotlin = "2.1.20-RC2"
 moshi = "1.15.2"
 
 [libraries]