Replace null_resource with terraform_data

[jansiwy]

null_resource is deprecated, as there is built-in terraform_data instead which can cover the use cases of null_resources (apart from other use cases):

https://developer.hashicorp.com/terraform/language/resources/terraform-data

Depends on:

• Discontinnue support for older Terraform versions

[deepsource-io]

Here's the code health analysis summary for commits 096c6d9..a41cd9d. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
Secrets	✅ Success		View Check ↗
Terraform	✅ Success	🎯 1 occurence resolved	View Check ↗

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[jtsaito]

Hm, it seems CI is running on Terraform version 1.1.9 but the new feature requires 1.9:https://github.com/hashicorp/terraform/pull/35171/files