Upgrade org.asciidoctor.jvm.convert Gradle plugin to 4.0.5

Closes gh-1980

Author: mhalbritter

start-site/src/main/java/io/spring/start/site/extension/dependency/springrestdocs/AbstractSpringRestDocsGradleBuildCustomizer.java

@@ -29,7 +29,7 @@ abstract class AbstractSpringRestDocsGradleBuildCustomizer implements BuildCusto
 
 	@Override
 	public void customize(GradleBuild build) {
-		build.plugins().add("org.asciidoctor.jvm.convert", (plugin) -> plugin.setVersion("3.3.2"));
+		build.plugins().add("org.asciidoctor.jvm.convert", (plugin) -> plugin.setVersion("4.0.5"));
 		build.properties().property("snippetsDir", "file(\"build/generated-snippets\")");
 		customizeForDialect(build);
 	}

start-site/src/test/java/io/spring/start/site/extension/dependency/springrestdocs/SpringRestDocsGradleGroovyBuildCustomizerTests.java

@@ -41,7 +41,7 @@ void customizesGradleBuild() {
 		this.customizer.customize(build);
 		assertThat(build.plugins().values()).singleElement().satisfies((plugin) -> {
 			assertThat(plugin.getId()).isEqualTo("org.asciidoctor.jvm.convert");
-			assertThat(((StandardGradlePlugin) plugin).getVersion()).isEqualTo("3.3.2");
+			assertThat(((StandardGradlePlugin) plugin).getVersion()).isEqualTo("4.0.5");
 		});
 		assertThat(build.properties().values()).contains(entry("snippetsDir", "file(\"build/generated-snippets\")"));
 		GradleTask testTask = build.tasks().get("test");

start-site/src/test/java/io/spring/start/site/extension/dependency/springrestdocs/SpringRestDocsGradleKotlinBuildCustomizerTests.java

@@ -41,7 +41,7 @@ void customizesGradleBuild() {
 		this.customizer.customize(build);
 		assertThat(build.plugins().values()).singleElement().satisfies((plugin) -> {
 			assertThat(plugin.getId()).isEqualTo("org.asciidoctor.jvm.convert");
-			assertThat(((StandardGradlePlugin) plugin).getVersion()).isEqualTo("3.3.2");
+			assertThat(((StandardGradlePlugin) plugin).getVersion()).isEqualTo("4.0.5");
 		});
 		assertThat(build.properties().values()).contains(entry("snippetsDir", "file(\"build/generated-snippets\")"));
 		GradleTask testTask = build.tasks().get("test");