Update Kotlin

Author: renovate[bot]

build.gradle.kts

@@ -11,11 +11,11 @@ buildscript {
 plugins {
     id("org.springframework.boot") version "2.5.4"
     id("io.spring.dependency-management") version "1.0.11.RELEASE"
-    id("org.jetbrains.kotlin.kapt") version "1.5.30"
+    id("org.jetbrains.kotlin.kapt") version "1.9.21"
     id("com.google.cloud.tools.jib") version "3.1.4"
     id("com.diffplug.spotless") version "5.14.2"
-    kotlin("jvm") version "1.5.20"
-    kotlin("plugin.spring") version "1.5.20"
+    kotlin("jvm") version "1.9.0"
+    kotlin("plugin.spring") version "1.9.21"
 }
 
 group = "org.codefreak.cloud"