Update to JDK 25 (release = 17)

This commit updates the build to use JDK 25 while remaining compatable with JDK 17.

Note that we must update our JAAS related tests to use release=25 due to the disabling of
the Security Manager. See
https://docs.oracle.com/en/java/javase/25/security/security-manager-is-permanently-disabled.html

Closes gh-18512

config/spring-security-config.gradle

@@ -4,6 +4,7 @@ import trang.RncToXsd
 apply plugin: 'io.spring.convention.spring-module'
 apply plugin: 'trang'
 apply plugin: 'security-kotlin'
+apply plugin: 'test-compile-target-jdk25'
 
 configurations {
 	opensaml5 {

config/src/test/java/org/springframework/security/config/http/MiscHttpConfigTests.java

@@ -19,7 +19,6 @@ package org.springframework.security.config.http;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
-import java.security.AccessController;
 import java.security.Principal;
 import java.security.cert.X509Certificate;
 import java.util.Arrays;
@@ -989,7 +988,7 @@ public class MiscHttpConfigTests {
 
 		@GetMapping("/username")
 		String username() {
-			Subject subject = Subject.getSubject(AccessController.getContext());
+			Subject subject = Subject.current();
 			return subject.getPrincipals().iterator().next().getName();
 		}