r/aws_rds_cluster: Fix crash when attempting to update master_password

[ewbankkit]

Description

Relations

Closes #30372.
Closes #30383.
Relates #28848.

References

Output from Acceptance Testing

% make testacc TESTARGS='-run=TestAccRDSInstance_password\|TestAccRDSInstance_basic' PKG=rds ACCTEST_PARALLELISM=3
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/rds/... -v -count 1 -parallel 3  -run=TestAccRDSInstance_password\|TestAccRDSInstance_basic -timeout 180m
=== RUN   TestAccRDSInstance_basic
=== PAUSE TestAccRDSInstance_basic
=== RUN   TestAccRDSInstance_password
=== PAUSE TestAccRDSInstance_password
=== CONT  TestAccRDSInstance_basic
=== CONT  TestAccRDSInstance_password
--- PASS: TestAccRDSInstance_basic (533.28s)
--- PASS: TestAccRDSInstance_password (693.91s)
PASS

ok  	github.com/hashicorp/terraform-provider-aws/internal/service/rds	700.100s
% make testacc TESTARGS='-run=TestAccRDSCluster_password\|TestAccRDSCluster_basic' PKG=rds ACCTEST_PARALLELISM=3
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/rds/... -v -count 1 -parallel 3  -run=TestAccRDSCluster_password\|TestAccRDSCluster_basic -timeout 180m
=== RUN   TestAccRDSCluster_basic
=== PAUSE TestAccRDSCluster_basic
=== RUN   TestAccRDSCluster_password
=== PAUSE TestAccRDSCluster_password
=== CONT  TestAccRDSCluster_basic
=== CONT  TestAccRDSCluster_password
=== CONT  TestAccRDSCluster_basic
    cluster_test.go:43: Step 1/2 error: Check failed: 3 errors occurred:
        	* Check 13/16 error: aws_rds_cluster.test: Attribute 'reader_endpoint' expected to be set
        	* Check 14/16 error: aws_rds_cluster.test: Attribute 'scaling_configuration.#' expected "0", got "1"
        	* Check 15/16 error: aws_rds_cluster.test: Attribute 'storage_encrypted' expected "false", got "true"
        
--- PASS: TestAccRDSCluster_password (189.34s)
--- FAIL: TestAccRDSCluster_basic (315.91s)
FAIL
FAIL	github.com/hashicorp/terraform-provider-aws/internal/service/rds	321.166s
FAIL
make: *** [testacc] Error 1

Failure is related to #30355.

[github-actions]

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[jar-b]

LGTM 👍

[github-actions]

This functionality has been released in v4.62.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

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