disable flaky test (#7202)

Signed-off-by: Sally MacFarlane <macfarla.github@gmail.com>

ethereum/p2p/src/test/java/org/hyperledger/besu/ethereum/p2p/discovery/dns/DNSDaemonTest.java

@@ -29,6 +29,7 @@ import org.bouncycastle.jce.provider.BouncyCastleProvider;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
@@ -73,6 +74,7 @@ class DNSDaemonTest {
   }
 
   @Test
+  @Disabled("this test is flaky")
   @DisplayName("Test DNS Daemon with periodic lookup to a mock DNS server")
   void testDNSDaemonPeriodic(final Vertx vertx, final VertxTestContext testContext)
       throws InterruptedException {