Update gradle.properties

1.0.31-release: bump to Kotlin 2.1.20-RC2

Author: mkmuir0

gradle.properties

@@ -1,7 +1,7 @@
 # Copied from kotlinc
 org.gradle.jvmargs=-Duser.country=US -Dkotlin.daemon.jvm.options=-Xmx4096m -Dfile.encoding=UTF-8
 
-kotlinBaseVersion=2.1.20-RC
+kotlinBaseVersion=2.1.20-RC2
 agpBaseVersion=8.10.0-alpha03
 intellijVersion=233.13135.128
 junitVersion=4.13.1