Upgrade to Kotlin 2.2.21

Closes gh-47887

Author: snicoll

gradle.properties

@@ -15,7 +15,7 @@ jackson2Version=2.20.1
 jacksonVersion=3.0.1
 javaFormatVersion=0.0.47
 junitJupiterVersion=6.0.0
-kotlinVersion=2.2.20
+kotlinVersion=2.2.21
 mavenVersion=3.9.10
 mockitoVersion=5.20.0
 nativeBuildToolsVersion=0.11.2