feat: add SPOT to Preemptibility enum (#3867)

* feat: add SPOT to Preemptibility enum

PiperOrigin-RevId: 503019826

Source-Link: googleapis/googleapis@77cd8f1

Source-Link: googleapis/googleapis-gen@a3b02db
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packages/google-cloud-dataproc/protos/google/cloud/dataproc/v1/clusters.proto

@@ -582,6 +582,16 @@ message InstanceGroupConfig {
     // (https://cloud.google.com/dataproc/docs/concepts/compute/secondary-vms)
     // groups.
     PREEMPTIBLE = 2;
+
+    // Instances are [Spot VMs]
+    // (https://cloud.google.com/compute/docs/instances/spot).
+    //
+    // This option is allowed only for [secondary worker]
+    // (https://cloud.google.com/dataproc/docs/concepts/compute/secondary-vms)
+    // groups. Spot VMs are the latest version of [preemptible VMs]
+    // (https://cloud.google.com/compute/docs/instances/preemptible), and
+    // provide additional features.
+    SPOT = 3;
   }
 
   // Optional. The number of VM instances in the instance group.