Deprecation notice from aws

[apenadiazApk]

Hi, reading the code I saw this line

https://github.com/terraform-aws-modules/terraform-aws-sns/blob/master/main.tf#L89

wich is in deprecation according to AWS doc, i guess is better change to SourceArn like the example in the same code right?

https://docs.aws.amazon.com/sns/latest/dg/sns-access-policy-use-cases.html#source-account-versus-source-owner

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[antonbabenko]

This issue has been resolved in version 6.1.3 🎉

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