Fix TargetSource setup for valid proxy interface specification

See gh-31304

spring-context/src/test/resources/org/springframework/beans/factory/xml/XmlBeanFactoryTests-depMaterializeThis.xml

@@ -13,7 +13,7 @@
 	</bean>
 
 	<bean id="prototypeBenchmark" class="org.springframework.aop.framework.ProxyFactoryBean">
-		<property name="target"><ref bean="prototypeTargetSource"/></property>
+		<property name="targetSource"><ref bean="prototypeTargetSource"/></property>
 		<property name="proxyInterfaces"><value>org.springframework.beans.factory.xml.DummyBo</value></property>
 	</bean>