Update AWS provider for terraform >= v0.13

[lantrix]

Change:

• terraform 0.13 and onwards requires new providers declaration
• shared_credentials_file is deprecated

Required commands to upgrade existing state from v0.12 to >= v0.13, tested with v1.2.9:

terraform state replace-provider -- -/random hashicorp/random
terraform state replace-provider -- -/archive hashicorp/archive
terraform state replace-provider -- -/aws hashicorp/aws
terraform init

A terraform version command then shows:

Terraform v1.2.9
on darwin_amd64
+ provider registry.terraform.io/hashicorp/archive v2.2.0
+ provider registry.terraform.io/hashicorp/aws v4.31.0
+ provider registry.terraform.io/hashicorp/random v3.4.3

There are a bunch of other AWS deprecated items, but I'll pop them in another PR after this to keep it cleaner.

[lantrix]

I've successfully redeployed with v1.2.9

[lantrix]

I guess this is no longer being maintained