Increase Timeout in SnapshotSTressTestsIT (#82020) (#82024)

If it takes more than 30s to complete all tasks it might also take
more time to resolve the outstanding tasks. These can take a lot of time
on OSX or slow file systems (i.e. WindowsFS from randomization).
Lets see if 2 minutes is enough in the real world.

closes #79718

server/src/internalClusterTest/java/org/elasticsearch/snapshots/SnapshotStressTestsIT.java

@@ -315,7 +315,7 @@ public void run() throws InterruptedException {
             }
 
             assertTrue(shouldStop.compareAndSet(false, true));
-            final long permitDeadlineMillis = threadPool.relativeTimeInMillis() + TimeUnit.SECONDS.toMillis(30);
+            final long permitDeadlineMillis = threadPool.relativeTimeInMillis() + TimeUnit.MINUTES.toMillis(2);
 
             final List<String> failedPermitAcquisitions = new ArrayList<>();
             acquirePermitsAtEnd(