Declare JdkDynamicAopProxy's ProxiedInterfacesCache as private

See gh-30499

spring-aop/src/main/java/org/springframework/aop/framework/AdvisedSupport.java

@@ -112,7 +112,7 @@ public class AdvisedSupport extends ProxyConfig implements Advised {
 
 	/**
 	 * Optional field for {@link AopProxy} implementations to store metadata in.
-	 * Used for {@link JdkDynamicAopProxy.ProxiedInterfacesCache}.
+	 * Used by {@link JdkDynamicAopProxy}.
 	 * @since 6.1.3
 	 * @see JdkDynamicAopProxy#JdkDynamicAopProxy(AdvisedSupport)
 	 */

spring-aop/src/main/java/org/springframework/aop/framework/JdkDynamicAopProxy.java

@@ -314,7 +314,7 @@ final class JdkDynamicAopProxy implements AopProxy, InvocationHandler, Serializa
 	 * to be cached in {@link AdvisedSupport#proxyMetadataCache}.
 	 * @since 6.1.3
 	 */
-	static final class ProxiedInterfacesCache {
+	private static final class ProxiedInterfacesCache {
 
 		final Class<?>[] proxiedInterfaces;