roachtest: give more disk space to schemachange/bulkingest

The test was failing due to insufficient space. The test size was
recently increased in f63c388, which is
the likely reason for the issue.

Release note: None

Author: rafiss

pkg/cmd/roachtest/tests/schemachange.go

@@ -339,7 +339,7 @@ func makeSchemaChangeBulkIngestTest(
 	return registry.TestSpec{
 		Name:             "schemachange/bulkingest",
 		Owner:            registry.OwnerSQLFoundations,
-		Cluster:          r.MakeClusterSpec(numNodes, spec.WorkloadNode()),
+		Cluster:          r.MakeClusterSpec(numNodes, spec.WorkloadNode(), spec.VolumeSize(200)),
 		CompatibleClouds: registry.AllExceptAWS,
 		Suites:           registry.Suites(registry.Nightly),
 		Leases:           registry.MetamorphicLeases,