4.0.0 deprecated warning

[seanturner026]

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Describe the Bug

When upgrading to 4.0.0, aws_iam_policy_document source_json should be replaced with source_policy_documents

https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/iam_policy_document#source_json

│   with module.ecr.data.aws_iam_policy_document.resource,
│   on .terraform/modules/ecr/main.tf line 138, in data "aws_iam_policy_document" "resource":
│  138:   source_json   = local.principals_readonly_access_non_empty ? join("", [data.aws_iam_policy_document.resource_readonly_access[0].json]) : join("", [data.aws_iam_policy_document.empty[0].json])
│
│ Use the attribute "source_policy_documents" instead.
│
│ (and one more similar warning elsewhere)

Expected Behavior

No deprecation warning

Steps to Reproduce

Steps to reproduce the behavior:

1. Go to cloudposse/terraform-aws-ecr/examples/complete
2. Run terraform plan -var 'region=us-east-1' ~3. Enter '....'~
3. See ~error~ deprecation warning

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Environment (please complete the following information):

Anything that will help us triage the bug will help. Here are some ideas:

• OS: [e.g. Linux, OSX, WSL, etc]
• Version [e.g. 10.15]

Additional Context

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