Fix flaky test: KeySharedSubscriptionTest.testCanRecoverConsumptionWhenLiftMaxUnAckedMessagesRestriction

Author: Masahiro Sakamoto

Diff for: pulsar-broker/src/test/java/org/apache/pulsar/client/impl/KeySharedSubscriptionTest.java

@@ -146,7 +146,7 @@ public void testCanRecoverConsumptionWhenLiftMaxUnAckedMessagesRestriction(Subsc
 
         // Wait for all consumers to continue receiving messages.
         Awaitility.await()
-                .atMost(15, TimeUnit.SECONDS)
+                .atMost(30, TimeUnit.SECONDS)
                 .pollDelay(5, TimeUnit.SECONDS)
                 .until(() ->
                         (System.currentTimeMillis() - lastActiveTime.get()) > TimeUnit.SECONDS.toMillis(5));