git: openjdk/jdk-sandbox: jep486: Update copyright headers

[duke]

Changeset: aabb6484
Branch: jep486
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2024-10-31 10:07:53 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/aabb6484e78d7caedaf9a2799bed33c4261caa24

Update copyright headers

! test/jaxp/javax/xml/jaxp/unittest/xpath/XPathPrecedingTest.java
! test/jdk/java/lang/reflect/Proxy/nonPublicProxy/SimpleProxy.java
! test/jdk/java/rmi/server/RemoteObject/toStub/ToStub.java
! test/jdk/java/security/cert/CertPathBuilder/GetInstance.java