fix initialization of serviceData in internal/conns

[perryao]

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Closes #21637
Relates #21641

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

[github-actions]

Welcome @perryao 👋

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.

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Thanks again, and welcome to the community! 😃

[YakDriver]

@perryao Thank you so much!

[github-actions]

This functionality has been released in v3.64.1 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]

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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.