Upgrade to Kotlin 2.2.21

Closes gh-1375

Author: bclozel

gradle.properties

@@ -5,6 +5,6 @@ org.gradle.daemon=true
 org.gradle.parallel=true
 org.gradle.jvmargs=-Dfile.encoding=UTF-8
 
-kotlinVersion=2.2.20
+kotlinVersion=2.2.21
 
 kotlin.stdlib.default.dependency=false