Unmute RestClientMultipleHostsIntegTests.testCancelAsyncRequests (ela…

…stic#101592)

The underlying issue is closed, so either this test should be running
correctly now, is still failing for valid reasons or can be removed.
Either way we need to enable it to see.

client/rest/src/test/java/org/elasticsearch/client/RestClientMultipleHostsIntegTests.java

@@ -258,7 +258,6 @@ public void onFailure(Exception exception) {
         }
     }
 
-    @Ignore("https://github.com/elastic/elasticsearch/issues/45577")
     public void testCancelAsyncRequests() throws Exception {
         int numRequests = randomIntBetween(5, 20);
         final List<Response> responses = new CopyOnWriteArrayList<>();