Update Kotlin plugin

Author: marcphilipp

settings.gradle.kts

@@ -9,7 +9,7 @@ pluginManagement {
 		id("com.github.ben-manes.versions") version "0.38.0"
 		id("com.diffplug.spotless") version "5.12.4"
 		id("org.ajoberstar.git-publish") version "3.0.0"
-		kotlin("jvm") version "1.4.0"
+		kotlin("jvm") version "1.5.0"
 		// Check if workaround in documentation.gradle.kts can be removed when upgrading
 		id("org.asciidoctor.jvm.convert") version "3.3.2"
 		id("org.asciidoctor.jvm.pdf") version "3.3.2"