Adapt to initializr deprecations

Author: mhalbritter

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

@@ -32,8 +32,8 @@ class ImportTestcontainersConfigurationTestApplicationTypeCustomizer
 	@Override
 	public void customize(TypeDeclaration typeDeclaration) {
 		typeDeclaration.annotations()
-			.add(ClassName.of("org.springframework.context.annotation.Import"), (annotation) -> annotation.set("value",
-					TestContainersApplicationCodeProjectContributor.TESTCONTAINERS_CONFIGURATION_CLASS_NAME));
+			.addSingle(ClassName.of("org.springframework.context.annotation.Import"), (annotation) -> annotation
+				.set("value", TestContainersApplicationCodeProjectContributor.TESTCONTAINERS_CONFIGURATION_CLASS_NAME));
 	}
 
 }

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

@@ -101,7 +101,7 @@ private void createTestcontainersConfiguration(S sourceCode) {
 		T testcontainersConfiguration = testcontainersConfigurationUnit
 			.createTypeDeclaration(TESTCONTAINERS_CONFIGURATION_CLASS_NAME.getSimpleName());
 		testcontainersConfiguration.annotations()
-			.add(TEST_CONFIGURATION_CLASS_NAME, (annotation) -> annotation.set("proxyBeanMethods", false));
+			.addSingle(TEST_CONFIGURATION_CLASS_NAME, (annotation) -> annotation.set("proxyBeanMethods", false));
 		this.serviceConnections.values()
 			.forEach((serviceConnection) -> configureServiceConnection(testcontainersConfiguration, serviceConnection));
 	}
@@ -122,8 +122,8 @@ protected void customizeApplicationTypeDeclaration(S sourceCode, Consumer<T> cus
 	}
 
 	protected void annotateContainerMethod(Annotatable annotable, String name) {
-		annotable.annotations().add(BEAN_CLASS_NAME);
-		annotable.annotations().add(SERVICE_CONNECTION_CLASS_NAME, (annotation) -> {
+		annotable.annotations().addSingle(BEAN_CLASS_NAME);
+		annotable.annotations().addSingle(SERVICE_CONNECTION_CLASS_NAME, (annotation) -> {
 			if (name != null) {
 				annotation.set("name", name);
 			}