set test java to 25, remove deprecated usage

Signed-off-by: Gregor Zeitlinger <[email protected]>

Author: zeitlinger

prometheus-metrics-exporter-httpserver/src/test/java/io/prometheus/metrics/exporter/httpserver/HTTPServerTest.java

@@ -47,7 +47,6 @@ public Result authenticate(HttpExchange exchange) {
           boolean found = false;
           Subject current = Subject.current();
           for (Principal p : current.getPrincipals()) {
-            System.out.println("p=" + p.getName());
             if (user.equals(p.getName())) {
               found = true;
               break;