dashboard/app: double the requested CPU

We changes the machine type to c3-highmem-8.
But forgot to double the CPU resources.

Author: tarasmadan

dashboard/app/batch_main.go

@@ -45,7 +45,7 @@ func createScriptJob(ctx context.Context, projectID, jobNamePrefix, script strin
 				}},
 				ComputeResource: &batchpb.ComputeResource{
 					// CpuMilli is milliseconds per cpu-second. This means the task requires 2 whole CPUs.
-					CpuMilli:  4000,
+					CpuMilli:  8000,
 					MemoryMib: 12 * 1024,
 				},
 				MaxRunDuration: &durationpb.Duration{