Adapt TKit to Java 21

Author: GoeLin

test/jdk/tools/jpackage/helpers/jdk/jpackage/test/TKit.java

@@ -551,7 +551,8 @@ private static void waitForFileCreated(Path fileToWaitFor, Duration timeout) thr
 
             var waitUntil = Instant.now().plus(timeout);
             for (;;) {
-                var remainderTimeout = Instant.now().until(waitUntil);
+                Instant n = Instant.now();
+                Duration remainderTimeout = Duration.between(n, waitUntil);
                 assertTrue(remainderTimeout.isPositive(), String.format(
                         "Check timeout value %dms is positive", remainderTimeout.toMillis()));