Upgrade to Asciidoctor Backends 0.0.4

Closes gh-33761

buildSrc/src/main/java/org/springframework/boot/build/AsciidoctorConventions.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2022 the original author or authors.
+ * Copyright 2012-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,7 +17,6 @@
 package org.springframework.boot.build;
 
 import java.io.File;
-import java.net.URI;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
@@ -39,13 +38,6 @@ import org.springframework.util.StringUtils;
  * the plugin is applied:
  *
  * <ul>
- * <li>The {@code https://repo.spring.io/release} Maven repository is configured and
- * limited to dependencies in the following groups:
- * <ul>
- * <li>{@code io.spring.asciidoctor}
- * <li>{@code io.spring.asciidoctor.backends}
- * <li>{@code io.spring.docresources}
- * </ul>
  * <li>All warnings are made fatal.
  * <li>The version of AsciidoctorJ is upgraded to 2.4.3.
  * <li>An {@code asciidoctorExtensions} configuration is created.
@@ -76,7 +68,6 @@ class AsciidoctorConventions {
 
 	void apply(Project project) {
 		project.getPlugins().withType(AsciidoctorJPlugin.class, (asciidoctorPlugin) -> {
-			configureDocumentationDependenciesRepository(project);
 			makeAllWarningsFatal(project);
 			upgradeAsciidoctorJVersion(project);
 			createAsciidoctorExtensionsConfiguration(project);
@@ -85,17 +76,6 @@ class AsciidoctorConventions {
 		});
 	}
 
-	private void configureDocumentationDependenciesRepository(Project project) {
-		project.getRepositories().maven((mavenRepo) -> {
-			mavenRepo.setUrl(URI.create("https://repo.spring.io/release"));
-			mavenRepo.mavenContent((mavenContent) -> {
-				mavenContent.includeGroup("io.spring.asciidoctor");
-				mavenContent.includeGroup("io.spring.asciidoctor.backends");
-				mavenContent.includeGroup("io.spring.docresources");
-			});
-		});
-	}
-
 	private void makeAllWarningsFatal(Project project) {
 		project.getExtensions().getByType(AsciidoctorJExtension.class).fatalWarnings(".*");
 	}
@@ -109,7 +89,7 @@ class AsciidoctorConventions {
 			project.getConfigurations().matching((candidate) -> "dependencyManagement".equals(candidate.getName()))
 					.all(configuration::extendsFrom);
 			configuration.getDependencies().add(project.getDependencies()
-					.create("io.spring.asciidoctor.backends:spring-asciidoctor-backends:0.0.3"));
+					.create("io.spring.asciidoctor.backends:spring-asciidoctor-backends:0.0.4"));
 			configuration.getDependencies()
 					.add(project.getDependencies().create("org.asciidoctor:asciidoctorj-pdf:1.5.3"));
 		});