update Kotlin to 2.1.20

Author: thestinger

gradle/libs.versions.toml

@@ -1,5 +1,5 @@
 [versions]
-kotlin = "1.9.22"
+kotlin = "2.1.20"
 
 [plugins]
 jvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }