Update kotlin to v1.9.21

Author: pvgnd

CHANGELOG.md

@@ -7,6 +7,7 @@
 ### Added
 
 ### Changed
+- Update kotlin to v1.9.21
 
 ### Deprecated
 

build.gradle.kts

@@ -6,9 +6,9 @@ plugins {
     // Java support
     id("java")
     // Kotlin support
-    id("org.jetbrains.kotlin.jvm") version "1.7.22"
+    id("org.jetbrains.kotlin.jvm") version "1.9.21"
     // Gradle IntelliJ Plugin
-    id("org.jetbrains.intellij") version "1.10.0"
+    id("org.jetbrains.intellij") version "1.15.0"
     // Gradle Changelog Plugin
     id("org.jetbrains.changelog") version "2.0.0"
     // Gradle Qodana Plugin