Update Javadoc theme to support more recent JDK versions

Author: marko-bekhta

local-build-plugins/src/main/groovy/local.javadoc.gradle

@@ -11,15 +11,12 @@ configurations {
 }
 
 dependencies {
-    themezip 'org.hibernate.infra:hibernate-asciidoctor-theme:5.1.1.Final@zip'
+    themezip 'org.hibernate.infra:hibernate-asciidoctor-theme:6.0.1.Final@zip'
 }
 
 tasks.register('unpackTheme', Copy) {
     def unpackDir = rootProject.layout.buildDirectory.dir("unpacked-theme")
 
-    onlyIf {
-        !unpackDir.get().asFile.exists()
-    }
     destinationDir = unpackDir.get().asFile
 
     def zipFile = configurations.themezip.singleFile
@@ -45,7 +42,7 @@ tasks.withType(Javadoc).configureEach {
         docTitle = "Hibernate Javadocs ($project.name : $project.version)"
         // Pick the styles for the JDK that is used to "build" the Javadocs:
         stylesheetFile = rootProject.layout.buildDirectory.dir("unpacked-theme").get()
-                .dir("hibernate-asciidoctor-theme").dir("javadoc").dir("jdk21").file("stylesheet.css").asFile
+                .dir("hibernate-asciidoctor-theme").dir("javadoc").dir("jdk"+jdkVersions.min.asInt()).file("stylesheet.css").asFile
         bottom = "Copyright &copy; 2001-$currentYear <a href=\"https://redhat.com\">Red Hat, Inc.</a>  All Rights Reserved."
 
         // The javadoc folder contains cached versions of the respective element-list files to avoid release issues when servers are down