Revert "fix(dokka): use version 1.9.20 of org.jetbrains.dokka (#4747)"

This reverts commit af347bb.

since https://github.com/spinnaker/orca/actions/runs/9490289564/job/26153470376 failed with:

Caused by: java.lang.NoSuchMethodError: 'org.jetbrains.dokka.model.DInterface org.jetbrains.dokka.model.DInterface.copy$default(org.jetbrains.dokka.model.DInterface, org.jetbrains.dokka.links.DRI, java.lang.String, java.util.Map, org.jetbrains.dokka.DokkaConfiguration$DokkaSourceSet, java.util.Map, java.util.List, java.util.List, java.util.List, java.util.Map, org.jetbrains.dokka.model.DObject, java.util.List, java.util.Map, java.util.Set, boolean, org.jetbrains.dokka.model.properties.PropertyContainer, int, java.lang.Object)'

Kotlin/dokka#2452 has some info, but I haven’t been able to make it work.

build.gradle

@@ -19,7 +19,7 @@ plugins {
   id "org.jetbrains.kotlin.jvm" version "$kotlinVersion" apply false
   id "org.jetbrains.kotlin.plugin.allopen" version "$kotlinVersion" apply false
   id "io.gitlab.arturbosch.detekt" version "1.17.1" apply false
-  id "org.jetbrains.dokka" version "1.9.20" apply false
+  id "org.jetbrains.dokka" version "1.4.32" apply false
 }
 
 allprojects {

gradle/dokka.gradle

@@ -19,7 +19,7 @@ apply plugin: "org.jetbrains.dokka"
 dokkaHtml {
   dokkaSourceSets {
     configureEach {
-      jdkVersion.set(17)
+      jdkVersion.set(11)
     }
   }
 }