Fix aws_ce_anomaly_subscription crash on update of monitor_arn_list

[ahuseby]

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Closes #25930

Output from acceptance testing:

$ make testacc TESTS=TestAccCEAnomalySubscription_MonitorARNList PKG=ce
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ce/... -v -count 1 -parallel 20 -run='TestAccCEAnomalySubscription_MonitorARNList'  -timeout 180m
=== RUN   TestAccCEAnomalySubscription_MonitorARNList
=== PAUSE TestAccCEAnomalySubscription_MonitorARNList
=== CONT  TestAccCEAnomalySubscription_MonitorARNList
--- PASS: TestAccCEAnomalySubscription_MonitorARNList (42.83s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/ce 42.893s

...

[github-actions]

Welcome @ahuseby 👋

It looks like this is your first Pull Request submission to the Terraform AWS Provider! If you haven’t already done so please make sure you have checked out our CONTRIBUTING guide and FAQ to make sure your contribution is adhering to best practice and has all the necessary elements in place for a successful approval.

Also take a look at our FAQ which details how we prioritize Pull Requests for inclusion.

Thanks again, and welcome to the community! 😃

[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccCEAnomalySubscription_' PKG=ce ACCTEST_PARALLELISM=2
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ce/... -v -count 1 -parallel 2  -run=TestAccCEAnomalySubscription_ -timeout 180m
=== RUN   TestAccCEAnomalySubscription_basic
=== PAUSE TestAccCEAnomalySubscription_basic
=== RUN   TestAccCEAnomalySubscription_disappears
=== PAUSE TestAccCEAnomalySubscription_disappears
=== RUN   TestAccCEAnomalySubscription_Frequency
=== PAUSE TestAccCEAnomalySubscription_Frequency
=== RUN   TestAccCEAnomalySubscription_MonitorARNList
=== PAUSE TestAccCEAnomalySubscription_MonitorARNList
=== RUN   TestAccCEAnomalySubscription_Subscriber
=== PAUSE TestAccCEAnomalySubscription_Subscriber
=== RUN   TestAccCEAnomalySubscription_Threshold
=== PAUSE TestAccCEAnomalySubscription_Threshold
=== RUN   TestAccCEAnomalySubscription_Tags
=== PAUSE TestAccCEAnomalySubscription_Tags
=== CONT  TestAccCEAnomalySubscription_basic
=== CONT  TestAccCEAnomalySubscription_Subscriber
--- PASS: TestAccCEAnomalySubscription_basic (16.95s)
=== CONT  TestAccCEAnomalySubscription_Frequency
--- PASS: TestAccCEAnomalySubscription_Frequency (27.36s)
=== CONT  TestAccCEAnomalySubscription_MonitorARNList
--- PASS: TestAccCEAnomalySubscription_Subscriber (57.87s)
=== CONT  TestAccCEAnomalySubscription_disappears
--- PASS: TestAccCEAnomalySubscription_disappears (12.68s)
=== CONT  TestAccCEAnomalySubscription_Tags
--- PASS: TestAccCEAnomalySubscription_MonitorARNList (26.44s)
=== CONT  TestAccCEAnomalySubscription_Threshold
--- PASS: TestAccCEAnomalySubscription_Threshold (27.57s)
--- PASS: TestAccCEAnomalySubscription_Tags (38.64s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ce	113.058s

[ewbankkit]

@ahuseby Thanks for the contribution 🎉 👏.

[github-actions]

This functionality has been released in v4.24.0 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!

[github-actions]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.