ESQL: Bump heap attack suite timeout

The heap attack test is growing so it is taking longer. We'll work to
speed it up, but for now, let's bump the timeout.

Closes elastic#121112

test/external-modules/esql-heap-attack/src/javaRestTest/java/org/elasticsearch/xpack/esql/heap_attack/HeapAttackIT.java

@@ -7,9 +7,12 @@
 
 package org.elasticsearch.xpack.esql.heap_attack;
 
+import com.carrotsearch.randomizedtesting.annotations.TimeoutSuite;
+
 import org.apache.http.HttpHost;
 import org.apache.http.client.config.RequestConfig;
 import org.apache.http.util.EntityUtils;
+import org.apache.lucene.tests.util.TimeUnits;
 import org.elasticsearch.client.Request;
 import org.elasticsearch.client.RequestOptions;
 import org.elasticsearch.client.Response;
@@ -64,6 +67,7 @@
  * Tests that run ESQL queries that use a ton of memory. We want to make
  * sure they don't consume the entire heap and crash Elasticsearch.
  */
+@TimeoutSuite(millis = 40 * TimeUnits.MINUTE)
 public class HeapAttackIT extends ESRestTestCase {
     @ClassRule
     public static ElasticsearchCluster cluster = Clusters.buildCluster();