r/aws_rds_cluster: Correct db_cluster_instance_class update

[ewbankkit]

Description

Ibid.

Relations

Closes #31686.

Output from Acceptance Testing

% make testacc TESTARGS='-run=TestAccRDSCluster_dbClusterInstanceClass\|TestAccRDSCluster_basic' PKG=rds
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/rds/... -v -count 1 -parallel 20  -run=TestAccRDSCluster_dbClusterInstanceClass\|TestAccRDSCluster_basic -timeout 180m
=== RUN   TestAccRDSCluster_basic
=== PAUSE TestAccRDSCluster_basic
=== RUN   TestAccRDSCluster_dbClusterInstanceClass
=== PAUSE TestAccRDSCluster_dbClusterInstanceClass
=== CONT  TestAccRDSCluster_basic
=== CONT  TestAccRDSCluster_dbClusterInstanceClass
--- PASS: TestAccRDSCluster_basic (159.10s)
--- PASS: TestAccRDSCluster_dbClusterInstanceClass (4655.92s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/rds	4661.383s

[github-actions]

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[github-actions]

This functionality has been released in v5.1.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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[github-actions]

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