PDFBOX-5660: use different time server

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1927443 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

examples/src/test/java/org/apache/pdfbox/examples/pdmodel/TestCreateSignature.java

@@ -193,7 +193,7 @@ void testTimeDifference() throws IOException, URISyntaxException
 
         // https://stackoverflow.com/questions/4442192/
         NTPUDPClient timeClient = new NTPUDPClient();
-        InetAddress inetAddress = InetAddress.getByName("time.nist.gov");
+        InetAddress inetAddress = InetAddress.getByName("pool.ntp.org");
         timeClient.setDefaultTimeout(Duration.ofMillis(5000));
         TimeInfo timeInfo;
         long returnTime;