Bump Terraform AWS provider from version 4 to 5

https://github.com/hashicorp/terraform-provider-aws/releases/tag/v5.0.0

Ref:
- https://trello.com/c/MIAiwlJ4/25-update-terraform-modules-to-support-aws-v5-providers

versions.tf

@@ -4,7 +4,7 @@ terraform {
     aws = {
       configuration_aliases = [aws.identity, aws.route53]
       source                = "hashicorp/aws"
-      version               = "~> 4.0"
+      version               = "~> 5.0"
     }
   }
 }