Update Kotlin version suffix

Author: rickclephas

build.gradle.kts

@@ -13,7 +13,7 @@ buildscript {
 
 allprojects {
     group = "com.rickclephas.kmp"
-    version = "1.0.0-BETA-7-kotlin-2.1.0-Beta2"
+    version = "1.0.0-BETA-7-kotlin-2.1.0-RC"
 
     repositories {
         mavenCentral()