Always include AttachmentsSources when updating SSM documents

[pbuchner]

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Closes #21725

Output from acceptance testing:

make testacc TESTS=TestAccSSMDocument_package PKG=ssm
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ssm/... -v -count 1 -parallel 20 -run='TestAccSSMDocument_package'  -timeout 180m
=== RUN   TestAccSSMDocument_package
=== PAUSE TestAccSSMDocument_package
=== CONT  TestAccSSMDocument_package
--- PASS: TestAccSSMDocument_package (48.91s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ssm	59.888s

make testacc TESTS=TestAccSSMDocument_update PKG=ssm                                                                                                                                                              
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ssm/... -v -count 1 -parallel 20 -run='TestAccSSMDocument_update'  -timeout 180m
=== RUN   TestAccSSMDocument_update
=== PAUSE TestAccSSMDocument_update
=== CONT  TestAccSSMDocument_update
--- PASS: TestAccSSMDocument_update (24.18s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ssm	33.752s

[github-actions]

Welcome @pbuchner 👋

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=TestAccSSMDocument_package\|TestAccSSMDocument_update' PKG=ssm
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ssm/... -v -count 1 -parallel 20  -run=TestAccSSMDocument_package\|TestAccSSMDocument_update -timeout 180m
=== RUN   TestAccSSMDocument_update
=== PAUSE TestAccSSMDocument_update
=== RUN   TestAccSSMDocument_package
=== PAUSE TestAccSSMDocument_package
=== CONT  TestAccSSMDocument_update
=== CONT  TestAccSSMDocument_package
--- PASS: TestAccSSMDocument_update (50.70s)
--- PASS: TestAccSSMDocument_package (78.08s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ssm	87.200s

[ewbankkit]

@pbuchner Thanks for the contribution 🎉 👏.

[github-actions]

This functionality has been released in v4.13.0 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.