1565: Only poll for updated MRs from GitLab

forge/src/main/java/org/openjdk/skara/forge/Forge.java

@@ -53,7 +53,7 @@ public interface Forge extends Host {
      * default returns 0 which means no special considerations are needed.
      */
     default Duration minTimeStampUpdateInterval() {
-        return Duration.ofMillis(0);
+        return Duration.ZERO;
     }
 
     static Forge from(String name, URI uri, Credential credential, JSONObject configuration) {

test/src/main/java/org/openjdk/skara/test/TestHost.java

@@ -55,7 +55,7 @@ public class TestHost implements Forge, IssueTracker {
     // Setting this field doesn't change the behavior of the TestHost, but it changes
     // what the associated method returns, which triggers different code paths in
     // dependent code for testing.
-    private Duration minTimeStampUpdateInterval = Duration.ofMillis(0);
+    private Duration minTimeStampUpdateInterval = Duration.ZERO;
 
     private static class HostData {
         final List<HostUser> users = new ArrayList<>();