Update dependency org.asciidoctor:asciidoctor-gradle-jvm to v4.0.0 (#599

)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

build.gradle

@@ -7,7 +7,7 @@ buildscript {
         classpath "org.codehaus.groovy.modules.http-builder:http-builder:0.7.2"
         classpath "io.github.gradle-nexus:publish-plugin:1.3.0"
         classpath "org.grails:grails-gradle-plugin:$grailsGradlePluginVersion"
-        classpath "org.asciidoctor:asciidoctor-gradle-jvm:4.0.0-alpha.1"
+        classpath "org.asciidoctor:asciidoctor-gradle-jvm:4.0.0"
         classpath "com.github.erdi:webdriver-binaries-gradle-plugin:3.2"
         classpath "org.grails.plugins:views-gradle:3.1.1"
     }