Remove unnecessary downcast to DefaultListableBeanFactory

See gh-33920
See gh-25952

spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClassBeanDefinitionReader.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -39,7 +39,6 @@
 import org.springframework.beans.factory.support.BeanDefinitionReader;
 import org.springframework.beans.factory.support.BeanDefinitionRegistry;
 import org.springframework.beans.factory.support.BeanNameGenerator;
-import org.springframework.beans.factory.support.DefaultListableBeanFactory;
 import org.springframework.beans.factory.support.RootBeanDefinition;
 import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
 import org.springframework.context.annotation.ConfigurationCondition.ConfigurationPhase;
@@ -318,7 +317,7 @@ protected boolean isOverriddenByExistingDefinition(BeanMethod beanMethod, String
 
 		// At this point, it's a top-level override (probably XML), just having been parsed
 		// before configuration class processing kicks in...
-		if (this.registry instanceof DefaultListableBeanFactory dlbf && !dlbf.isBeanDefinitionOverridable(beanName)) {
+		if (!this.registry.isBeanDefinitionOverridable(beanName)) {
 			throw new BeanDefinitionStoreException(beanMethod.getConfigurationClass().getResource().getDescription(),
 					beanName, "@Bean definition illegally overridden by existing bean definition: " + existingBeanDef);
 		}