Update Kotlin to v1.5.30

Author: renovate-bot

build.gradle.kts

@@ -14,8 +14,8 @@ plugins {
     id("org.jetbrains.kotlin.kapt") version "1.5.30"
     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 "1.5.30"
+    kotlin("plugin.spring") version "1.5.30"
 }
 
 group = "org.codefreak.cloud"