Upgrade Dokka to 1.6.0

Closes gh-27815

Author: sdeleuze

build.gradle

@@ -2,7 +2,7 @@ plugins {
 	id 'io.spring.dependency-management' version '1.0.11.RELEASE' apply false
 	id 'io.spring.nohttp' version '0.0.10'
 	id "io.freefair.aspectj" version '6.3.0' apply false
-	id 'org.jetbrains.dokka' version '1.5.0' apply false
+	id 'org.jetbrains.dokka' version '1.6.0' apply false
 	id 'org.jetbrains.kotlin.jvm' version '1.6.10' apply false
 	id "org.jetbrains.kotlin.plugin.serialization" version '1.6.10' apply false
 	id 'org.asciidoctor.jvm.convert' version '3.3.2'