Deprecate getBeanFactory() method in AbstractBeanDefinitionReader

The getBeanFactory() method has been obsolete for more than 13 years
since it was superseded by the getRegistry() method in the
BeanDefinitionReader interface.

Closes gh-27875

spring-beans/src/main/java/org/springframework/beans/factory/support/AbstractBeanDefinitionReader.java

@@ -107,7 +107,10 @@ public abstract class AbstractBeanDefinitionReader implements BeanDefinitionRead
 	 * Return the bean factory to register the bean definitions with.
 	 * <p>The factory is exposed through the BeanDefinitionRegistry interface,
 	 * encapsulating the methods that are relevant for bean definition handling.
+	 * @deprecated as of Spring Framework 5.3.15 in favor of {@link #getRegistry()},
+	 * to be removed in Spring Framework 6.0
 	 */
+	@Deprecated
 	public final BeanDefinitionRegistry getBeanFactory() {
 		return this.registry;
 	}