Increase timeout for testNotificationRuleTest because it has become flaky

Signed-off-by: Tobias Gies <tobias@tobiasgies.de>

Author: tobiasgies

src/test/java/org/dependencytrack/resources/v1/NotificationPublisherResourceTest.java

@@ -51,6 +51,7 @@
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.Timeout;
 import org.junit.jupiter.api.extension.RegisterExtension;
 
 import java.time.Duration;
@@ -366,6 +367,7 @@ public void testSmtpPublisherConfigTest() {
     }
 
     @Test
+    @Timeout(20)
     public void testNotificationRuleTest() {
         NotificationPublisher publisher = qm.createNotificationPublisher(
                 "Example Publisher", "Publisher description",