Adapt to changes in the initialzr library

start-site/src/main/java/io/spring/start/site/extension/dependency/testcontainers/KotlinTestContainersApplicationCodeProjectContributor.java

@@ -46,7 +46,7 @@ class KotlinTestContainersApplicationCodeProjectContributor extends
 	KotlinTestContainersApplicationCodeProjectContributor(IndentingWriterFactory indentingWriterFactory,
 			ProjectDescription description, ServiceConnections serviceConnections) {
 		super(description, serviceConnections, KotlinSourceCode::new,
-				new KotlinSourceCodeWriter(indentingWriterFactory));
+				new KotlinSourceCodeWriter(description.getLanguage(), indentingWriterFactory));
 	}
 
 	@Override