test(aks): update Kubernetes version in integration tests

- Upgrade initial cluster version from 1.31.8 to 1.32.4
- Add version upgrade test from 1.32.4 to 1.33.1
- Verify version assertions after cluster refresh operations
- Ensure version update functionality works as expected

Author: v-huizhu2

sdk/containerservice/azure-resourcemanager-containerservice/src/test/java/com/azure/resourcemanager/containerservice/KubernetesClustersTests.java

@@ -564,7 +564,7 @@ public void testUpdateKubernetesVersion() {
             .define(generateRandomResourceName("aks", 15))
             .withRegion(Region.US_WEST2)
             .withExistingResourceGroup(rgName)
-            .withVersion("1.31.8")
+            .withVersion("1.32.4")
             .withRootUsername("testaks")
             .withSshKey(SSH_KEY)
             .withSystemAssignedManagedServiceIdentity()
@@ -578,11 +578,11 @@ public void testUpdateKubernetesVersion() {
             .create();
 
         kubernetesCluster.refresh();
-        Assertions.assertEquals("1.31.8", kubernetesCluster.version());
+        Assertions.assertEquals("1.32.4", kubernetesCluster.version());
 
-        kubernetesCluster.update().withVersion("1.32.4").apply();
+        kubernetesCluster.update().withVersion("1.33.1").apply();
         kubernetesCluster.refresh();
-        Assertions.assertEquals("1.32.4", kubernetesCluster.version());
+        Assertions.assertEquals("1.33.1", kubernetesCluster.version());
     }
 
     @Test