Refactor aws s3 bucket to be compatible with Aws provider 4.0

[jim80net]

terraform-aws-datadog/logs_monitoring_elb.tf

Line 28 in b0c3afe

resource "aws_s3_bucket" "elb_logs" {

terraform-provider-aws 4.0.0 was released, introducing a breaking change to how s3 buckets are defined.

This resource should be refactored to comply with the 4.0 standard. Since doing so breaks compatibility with <4.0.0, this should also increment the major versions and create a new branch.

A migration guide should also be published for users who are on terraform-provider-aws 3.x and desire to upgrade to 4.x